Steam Download Stuck or Slow? How to Fix 0%, 99% and "Reserving Space"

Most stalled or slow Steam downloads have one of four causes: your drive cannot keep up, the download region is overloaded, your download cache has gone bad, or something on your network is interfering. Open Steam's Downloads page and compare the network and disk figures first. If the network speed is high but progress is crawling, your drive is the bottleneck. If the network speed is near zero, change your download region and then clear the download cache.

Very few things are as irritating as a game you have paid for sitting at 99 percent for an hour. The temptation is to restart everything and hope, but Steam's downloads are not one single process. They involve fetching compressed data, unpacking it, writing it to disk, and then checking it. A stall at each of those stages has a different cause and a different fix. This guide helps you identify which stage you are stuck in, starting with the quickest possible checks, and working through to the rarer problems.

Key facts

• Steam downloads are compressed, so your drive has to unpack and write data as it arrives, and a slow drive can limit the whole process.
• Changing your download region under Settings > Downloads can help when your current region is busy or faulty.
• Clearing the download cache flushes locally cached configuration data. Valve says it does not affect installed games, but you will have to sign in again.
• "Bytes" and "bits" are different: a 100 Mbps connection delivers a maximum of about 12.5 MB/s.
• Steam's Downloads page can show how much of your limit comes from network activity versus disk activity.
• Steam can be set to limit bandwidth, and that setting is a common cause of unexpectedly slow speeds.
• Repeated disk errors during downloads may point to a failing drive, so do not ignore them.

First, check whether you are really slow

Many "slow" downloads are simply a misunderstanding of units. Internet plans are sold in megabits per second (Mbps). Steam shows speeds in megabytes per second (MB/s). There are 8 bits in a byte, so divide your plan speed by 8 to get your real maximum.

Those are ideal figures. Real speeds tend to be somewhat lower. If you are on a 100 Mbps plan and seeing 11 MB/s, then everything is working correctly.

To see what you are actually getting, open Steam and click the Downloads indicator at the bottom of the window. The page shows current speed along with a graph, and it can show disk usage too. Run a separate speed test in your browser while Steam is paused. If your internet test is much faster than Steam, continue through this guide. If it is about the same, your connection is the limit, and no Steam setting will change that.

The quick fixes, in the right order

Work through these in order. Each one takes a minute or two.

1. Pause and resume. Click pause on the Downloads page, wait 10 seconds, and resume. This forces Steam to reconnect, and it will sometimes land on a less busy server.

2. Check your bandwidth limit. Go to Steam > Settings > Downloads and see whether the option to limit download speed is on. People often set a limit for a video call, and then forget about it. Also look for any setting that slows downloads during streaming, and turn it off if you are not streaming.

3. Change your download region. On the same page, try another region. Steam picks one automatically, but if that region's servers are overloaded or faulty, then moving can help. Start with another location near you and then try a different one. Valve's developer documentation notes that setting a far-off region can even help when a nearby server is serving bad data. Note that big launches and major updates can overload a whole region, so try again later if the region change makes no difference.

4. Clear the download cache. Go to Settings > Downloads and use the Clear Download Cache button at the bottom. Valve explains that this flushes locally cached configuration data, so that Steam fetches it from its servers again. It does not affect installed games, but you will need to sign back in. Do make sure that you know your password and have your Steam Guard access at hand.

5. Restart everything. Fully exit Steam from the system tray or the Steam menu, then restart your computer. Valve's general advice is that a restart releases file locks and other resources. Restart your modem and router too, since network equipment can drift into a poor state after running for a long while.

6. Verify the game. If a game is already partly installed, right-click it, open Properties, go to Installed Files and verify the integrity of the game files. This looks for damaged or missing data and gets only what is needed.

Reading the network and disk figures

If the quick fixes have not helped, compare the two speeds on Steam's Downloads page.

Network speed high, progress slow, disk busy. Your drive is the bottleneck. Steam downloads data in compressed form, unpacks it and writes it to disk, which is a lot of small work for a hard drive. The result is that a fast connection can far outrun a slow disk. Steam may pause the network side to let the disk catch up. This can make it look as if the download has stalled, when it is actually working hard.

Network speed low, disk idle. The problem is on the internet side. Focus on region, router, ISP and VPN.

Both near zero. Steam may have lost its connection altogether, or something might be blocking it. A firewall, antivirus or VPN should be your first suspects, followed by a server-side outage.

To confirm a disk bottleneck, open Windows Task Manager, click the Performance tab, and look at your target drive. A drive that is sitting at or near 100 percent active is the issue.

Fixing "Steam download slow but internet fast"

This is one of the most common searches, and in most cases the answer is the disk. Here is what to do about it.

Install to an SSD if you can. Hard drives handle the many small writes that downloads involve quite poorly. If you have an SSD with free space, add it as a library and install there. Our guide to moving Steam games to another drive shows you how to add a library and how to shift things around to make room.

Free up space. Drives that are nearly full tend to slow down, and Steam needs temporary space for updates. Aim to keep at least 10 to 15 percent of the drive free.

Stop anything else using the disk. Windows Update, OneDrive syncing, antivirus scans, and other downloads all compete for disk attention. Check Task Manager's Disk column to see what is busy.

Add an antivirus exclusion for your Steam library. Real-time scanning can inspect every file as it gets written, which adds a large overhead during a download. Valve regularly identifies antivirus as a cause of Steam problems. Add an exclusion for your library folder instead of turning off protection.

Do not defragment or scan during a download. Valve warns against running intensive disk tasks while verifying files, and the same logic applies to downloading. Never defragment an SSD at all.

Try turning off game downloads during gameplay. If you are playing a game while downloading another, both compete for the same resources. Steam has a setting for whether to allow downloads during gameplay.

Fixing "stuck on reserving space"

When you begin an install, Steam sometimes needs to allocate the full size of the game on your drive before it can begin writing. On a large game with a hard drive, that can take several minutes, and the progress bar can seem frozen.

If it is genuinely stuck:

1. Check that the drive has enough free space for the game. Note that a game's installation can temporarily need more than its final size, because updates require working room.
2. Open Task Manager and see if the disk is busy. Disk activity means that the allocation is still happening, so give it time.
3. Exit Steam and restart it to release any locks on the files.
4. Try the install on another drive to see whether the issue is specific to the original one.
5. Run Windows error checking on the drive, as a file system problem can cause this kind of hang.

Fixing "stuck at 99 percent"

Reaching 99 percent and stopping is nearly always the end-of-install work rather than a failed download. The final phase can involve unpacking large files, moving them into place, and then validating them. A game can spend a long time there, especially on a hard drive, and in particular when it is a big update rather than a new install.

Look at the Downloads page and Task Manager. If the disk is active, leave it alone. Forcing it to stop can leave you with a damaged install and a much longer repair.

If there has been no disk activity at all for 20 to 30 minutes:

• Pause and resume the download.
• Exit Steam fully and restart it.
• Verify the game files.
• Check that antivirus software has not quarantined any part of the game.
• Clear the download cache.

A note on "verifying files" at 99 percent: this is simply Steam checking its work. It may look slow on large games, and running other heavy disk tasks at the same time makes it worse. If you are stuck at a verification step, close anything else that is reading from the disk.

Fixing "stuck at 0 percent"

A download that never starts tends to be about connection or configuration rather than the disk.

• Clear the download cache first, as stale configuration data is a classic cause.
• Change your download region.
• Turn off any VPN or proxy and try again.
• Add Steam to your firewall's allowed list.
• Restart your router.
• Check whether there is a Steam outage. A quick search for whether Steam servers are currently down will tell you if other people are affected. During major sales or weekly maintenance windows, there can be short-lived problems which you cannot fix from your end.

Fixing "content servers unreachable" and "no internet connection"

These errors mean that Steam cannot reach the servers that it needs to download from.

Valve explains in its cloud troubleshooting notes that some internet providers, especially cellular networks, cache or compress data, and this can cause problems with Steam. It suggests testing a totally different network, ideally from a different provider, and this is equally useful for downloads. Tethering to a phone for two minutes is enough to find out if your home connection is responsible, without using much data, as long as you pause the download once it has started moving.

You should also check for these:

• Proxy settings. In Windows, open Settings, then Network & Internet, then Proxy. Turn off any manual proxy that you did not set up yourself.
• DNS problems. If websites load slowly or some things fail, try a well-known public DNS provider on your router or network adapter.
• Router security features. Some routers include "security" or "parental" filters which block large transfers. Try disabling them temporarily.
• Date and time. An incorrect system clock can cause secure connections to fail. Let Windows set it automatically.

Download "disk write error" messages

If the download stops with a disk write error, then this is a separate problem with its own causes. Our guide to fixing Steam disk write errors goes through it in detail. Treat this as a warning rather than a mere annoyance: Valve says that the main cause of this error is generally a problem with the hard drive itself.

Slow downloads on a Steam Deck or laptop

Portable devices have additional causes:

• Wi-Fi band. Connect to a 5 GHz network if your router offers one, and stay close to the router. Long downloads on a congested 2.4 GHz network can be very slow.
• Sleep mode. A machine that sleeps during a download will stop. On Windows, adjust the power settings while plugged in. On a Steam Deck, keep it charging and check how it behaves while downloading in sleep.
• Power saving. Some laptops reduce network and disk performance on battery. Plug in for long downloads.
• Slow SD cards. A cheap microSD card can limit an install badly. Our guide to Steam Deck storage explains what to look for.

Why updates can be slower than new installs

An update can take longer than its size suggests. Rather than simply adding new data, Steam usually needs to work out what has changed, patch existing files and rewrite large archives. A 5 GB update can force the drive to rewrite far more than 5 GB, and on a hard drive this is slow. If updates routinely take a long time, moving that game to an SSD will have a much bigger effect than getting faster internet.

It also means that you need more free space than the update size. A game can need a large temporary working area during a patch. If an update fails because of insufficient space despite being "small", this is usually why.

Controlling when Steam downloads

If downloads get in the way of your day-to-day use, then take control of them instead of fighting them.

If you have a capped internet plan, keep an eye on how much you are downloading. Setting rarely played games so that they only update when you launch them can prevent surprise multi-gigabyte patches. It can also spare you from having to wait for a large update on a game you are about to play, as long as you plan ahead.

When to contact Steam Support or your ISP

If every game is slow at all hours, at all regions, and your browser speed test is fine, you can ask your ISP whether there is any traffic management going on. Some ISPs manage large downloads during peak times. If only one game is affected, the problem may lie with that game, and it is worth checking its community hub to see whether others are reporting the same.

For Steam-side trouble, open a ticket through Steam Support, and have this ready:

• The name of the affected game.
• The exact error message and an uncropped screenshot.
• What you have already tried.
• Your download region, and whether a different one helps.

Waiting for a big game? Use the time well

If a 100 GB download is going to take all night, at least you can use the wait productively. You could check whether the game was worth the price, using our guide to Steam's refund rules, or look up the cheapest ways to buy your next game.

You can also open an XPReward account and spend some of that idle time on offers that earn points toward a Steam gift card. Remember that a $25 card takes 3,600 points and that the number of offers depends on your country, so check what is available to you before you set your heart on it.

Frequently asked questions

Why is my Steam download so slow when my internet is fast?

Your disk is the most likely cause. Steam unpacks and writes data as it arrives, and a hard drive can fall behind a fast connection. Check for disk activity on the Downloads page or in Task Manager, close other programs using the drive, or install to an SSD.

Why is my Steam download stuck at 99 percent?

The last stage involves unpacking, moving and checking files, which can take a long time for large games. If your disk is active, wait. If nothing has happened for 20 to 30 minutes, pause and resume, restart Steam, and verify the game files.

What does "reserving space" mean on Steam?

Steam is allocating room on your drive before it writes the game. On large games and slower disks this can take several minutes. If your drive shows no activity for a long time, confirm that you have enough free space and restart Steam.

Does clearing the Steam download cache delete my games?

No. Valve says it flushes locally cached configuration data and does not affect installed games. You will need to sign in to Steam again afterward, so make sure that you have your password and Steam Guard access available.

What download region should I choose on Steam?

Start with the region closest to you, and try a neighboring one if speeds are poor. Steam selects automatically, but a busy or faulty region can be slow. Sometimes a more distant region performs better, particularly during a large release.

Why does Steam show 12 MB/s on my 100 Mbps connection?

Because internet speeds are sold in megabits and Steam shows megabytes. Eight bits make a byte, so a 100 Mbps connection tops out around 12.5 MB/s. If you are seeing about that, your download is running at full speed.

How do I stop Steam from slowing down my internet?

Set a limit under Settings > Downloads, or schedule auto-updates for overnight. You can also change a rarely played game's update behavior in its properties so that it only updates when you launch it.

What does "content servers unreachable" mean?

Steam cannot reach the servers that hold the game data. Change your download region, turn off any VPN or proxy, restart your router and allow Steam through your firewall. If it happens during a big launch, wait a while and try again.

Sources

• Steam Support, Valve's knowledge base on download regions, the download cache and disk errors.
• Steam Support: Verify Integrity of Game Files, for the file verification process.
• Steam Support: Steam Cloud, for Valve's network, firewall and antivirus troubleshooting notes.
• Steamworks Documentation: Uploading to Steam, for the note about trying a distant download region.

The speed table uses simple arithmetic and assumes ideal conditions. Steam settings checked on 8 November 2026.