What to do when chrome starts slowly [summary] browser, such as the deletion of the download history


The following is a brief explanation of how to process the web browser "Chrome", especially to speed up the startup.

# If you just delete the download history and you get a considerable effect (see below).

【Update history】Added about the limit of the number of processes for drawing.

Measures that can be expected to be effective

Delete your download history from Settings

Chrome toolbar menu icon (top right of screen) > Settings > Settings main menu (top left) > Advanced settings > Privacy and security > Erase browsing history data > Download history > Erase items for the next period > All > Download history checkbox


This will have a considerable effect without deleting other history or cache (temporary files).could improve dramatically.

Chrome is most likely to slow down, because for some reason, you're doing a lot of writing to the storage at startup.This is why access to HDDs increases extremely.

Are you trying to fix a corrupt download history file?

Or are you trying to write something that can be re-downloaded at startup?

In any case, it seems to go crazy when the download history increases.

This trend is especially noticeable when you're introducing extensions like the Chrono Download Manager.

Exclude Chrome-related folders from security software monitoring

Here's the case with Windows 10.

Make the following folders excluded:

[Chrome body]
C:Program FilesGoogleChrome

[Chrome app data]
C:Users@OS usernameAppDataGoogleChrome

The following is the case of Windows Defender, the standard windows 10.

Start Menu
>Updates and Security
>Windows Security
> Open Windows Defender Security Center
> Virus and threat prevention
> Virus and Threat Prevention Settings
> Add or remove exclusions
> Add exclusions
> Folders


Chrome starts a lot of processes (executables .exe) and accesses a lot of files, so it's slow when security software (anti-virus software) intervenes each time.

Malware is less likely to slip inside Chrome, and now that extensions and security measures have been enhanced, the risk is low.

As a result, in most cases, it's probably okay to remove chrome-related folders from security checks.

However, it is at your own risk because there is a possibility of an unlikely event.

Disable/remove software reporter tool

It's on the side of the app data instead of the folder on the Chrome console, so delete it or rename it to an alias.

[For Windows 10]

C:Users@OS usernameAppDataLocalGoogleChromeUser DataSwReporterChrome version name_software_reporter_tool.exe


The Software Reporter Tool is an independent software that checks settings, such as whether Chrome is functioning properly or being blocked by malware.

So to speak, chrome is a specialized security tool.

It only starts occasionally, but once it starts to work, cpu usage jumps, access to hdd and other storage increases dramatically, and it takes up a lot of pc resources.

Moreover, it continues for a certain time.

In most cases, things that will have a negative impact on Chrome's behavior rarely happen, so it's ok to turn it off.

However, software_reporter_tool.exe will be resurrected every time the Chrome console is updated, so you have to change it every time.

Disable and remove extensions

On the screen of "Menu Se-E-Yi-Other Tools", disable or "delete" with the switch in the lower right corner of each extension column.


All extensions are set up to be initialized when chrome console starts, and updates may be checked.

In other words, the more extensions you install, the slower it starts, and the more memory you consume.

If you disable it without permanently deleting it, it will be faster to activate it at any time, so it's better to actively disable extensions that you don't use often.

Basically, the more memory you're consuming, the slower it starts up and down, so check with Chrome's Task Manager.

Chrome toolbar menu icon (upper right)
> Other tools
> Task Manager


Right-click on the tab bar at the top of the window
>Task Manager menu

However, there are rare heavy extensions to handle, so you don't have to worry too much about it overall.

Try to remove as much as possible

Disabled extensions, of course, are not launched at the same time when chrome starts, but in fact, updates are checked and installed automatically.

Since extension updates are performed periodically at startup, even if disabled, it can be under a certain load.

The more you have, the bigger the load, so you should remove extensions that you don't use as much as possible.

Disable cache

Dare not use the file cache (local temporary save file) at all.

"Disable" instead of deleting the cache.

It cannot be changed from the normal setting screen, and it becomes the form of applying the start option.

[For Windows 10]

The quickest way to change the properties of a shortcut.

Right-click the Chrome icon on your desktop and select Properties from the menu.

At the end of the text in the "Link to" column, make room for the next text.

--disk-cache-size=0 --media-cache-size=0

If it is a standard state, it should look like the following in the end.

"C=Program FilesGoogleChromeApplicationchrome.exe" --disk-cache-size=0 --media-cache-size=0


The cache is a temporary file-like storage of data downloaded from the web in local storage.

If there is a cache for the data of a particular URL, because it basically reads in preference to that, to reduce the data usage if originally, it should be able to speed up.

However, every time you access it, you follow the following steps, which may be rather slow in some cases (depending on the environment).

Check to see if there is data in the cache (storage load)
Check for the latest data (storage load)
【If present】
Data loading (storage load)
【If it does not exist】
Writing data (storage write)

If you do not use caching, the above steps are omitted.

This is an effective method, for example, when storage such as hdDs is slow.

Even if the cache is set to small, in most cases there is no problem = feel the difference in the experience speed, the extent to which it feels a little slow at the time of reloading the exact same page at most.

So, better try to set the settings that do not use the cache more.

However, if you are using high-speed storage such as SSD, there is a possibility to backfire, in the medium where the number of writeable times such as SSD is overwhelmingly less than hdd to begin with, it should not be used for caching purposes.

Disable prediction services

Turn off the following:

Chrome Toolbar menu icon - top right of the screen > Settings > Settings Main Menu > Settings > Advanced > Privacy and Security > Loading pages more quickly using the prediction service


The so-called destination page lookahead function.

Chrome predicts the next link that will be clicked and loads the data at that link in advance.

This could be the cause if the current page is loaded and for some reason the machine or network resource is still being consumed.

If there is no room in the machine's memory or network bandwidth, it will feel slower.

In most cases, no problem to turn off.

Limiting the number of drawing processes

Set chrome startup options in the following ways:

Right-click the Chrome shortcut icon on the desktop screen, etc.
>Menu "Properties"
>Tab "Shortcuts"
> Write the following text with a space at the end of the "Link To" column
If you are running Chrome, restart it.

Write the number of processes in the number part.

3-5 would be appropriate, but 2 would work well.

(Note that there are two hyphens at the beginning of the "–".)

If you install it in a standard position in Windows 10, it should eventually look something like this:

[C=Program FilesGoogleChromeApplicationchrome.exe_ --renderer-process-limit=5

From the beginning, there may be options such as "–profile-directory="Default",, but this is an option to start with a Chrome profile.

"–renderer-process-limit=5" may be written before or after it, but it is necessary to separate each with a space.


This is surprisingly important.

Chrome processes tabs and windows in separate processes (software units), so the more processes you open, the more processes you have, and the more memory you'll consume.

The fact that the process is independent means that if you have problems with a particular tab/window, you'll only close them, so the whole software will go down like you did in the old browser.

In addition, if the memory, such as a personal computer / smartphone is rich, it is also possible to operate at high speed.

However, if the memory is small, the swap of the data to be used (transfer from physical memory to virtual memory = storage) will occur, contrary to the above merits, processing is slow, the entire browser becomes unstable.

Therefore, by dare to limit the number of processes that Chrome starts, and leave the processing of multiple tabs / windows to a single process, the behavior may be stable and faster as a result.

Measures that are not expected to be very effective

The following is what seems to be not very effective even if it does.

Try the above one but let's try it if there is no change.

Turn off spell checking

Chrome Toolbar menu icon (top right) > Settings > Settings main menu (top left) > Advanced > Privacy and Security > Web services to help you resolve spelling mistakes


English spell check function in text input field.

Because the input is sent to Google every time, there is a problem from the viewpoint of privacy protection in the first place.

Before that, it would be almost meaningless if you didn't use English much.Therefore, the effect of the speed is also thin.

Clear browsing history data

  • Cached images and files
  • Browsing history

Chrome toolbar menu icon – top right of the screen – Settings > Settings Main Menu – Top Left Of The Screen > Advanced Settings > Privacy and Security > Erase browsing history data


Many sites recommend that you delete all the caches, but the cache is being replaced more and more, and it's basically not related to startup processing in the first place, so you can't expect much effect.

Data such as browsing history and cookies rarely affect the processing largely unless the number is very large.

If you delete cookies, you will need to log in again on most sites, which reduces convenience and has a greater disadvantage.

The same is true for bookmarks, the case that takes a long time to load and display bookmarks on a relatively recent level of machine, as long as the number is not very large, here also has no effect on the experience.about a few hundred, almost for a moment.

Other than deleting the download history, it can be said that there is not much need to do.

Reset settings

Use chrome default features to reset all settings.

Chrome toolbar menu icon (top right of screen) > Settings > Settings Main Menu >Screen Top Left> Advanced > Reset and Cleanup > Restore the settings to the original settings


If it's obviously slow after a lot of experimenting, try resetting the settings.

In particular, if you have to play with the following chrome://flags, it is easy to get a problem.

Clean up your computer

Use Chrome's default feature to search the entire OS for something that causes a browser to malfunction.

Chrome Toolbar menu icon – top right of the screen – Settings > Settings Main Menu – Screen Top Left > Advanced Settings > Reset and Cleanup > Computer Cleanup


Dare to use the Software Reporter Tool above.

However, the story that it was accelerated thanks to this is hardly heard.

Create a new profile

Register a new user (profile) and use it.

Chrome toolbar menu icon – top right of the screen > Settings > Manage other users > Add users


Chrome is not noticed much when you use the default, but there is a function to switch the settings and the like for each user the same as the OS.

Firefox profile feature.

If Chrome is working wrong, it may be corrupted, such as the configuration file, so you may be able to switch between the user itself and the effect will be.

It's easy to undo, so it's worth a try.

However, all required extensions and bookmarks must be reinstalled (more info).

Chrome console updates

Chrome Toolbar menu icon – Top right of the screen – Help > About Google Chrome


If something goes wrong with everything you've tried, there may be a glitch in chrome's software itself.

Chrome is basically auto-updated, but you can do it manually using the above methods.

Clean installation of Chrome console

Uninstall and reinstall.

Even if you uninstall your Chrome console, the settings-related folder files will remain, so you may want to back them up to a different location and delete them.


last resort.

If this doesn't improve, it could be an OS or hardware problem.

Points to note

You should not use chrome://flags.

You can change settings and features under development in a special URL called "chrome://flags" on the screen.

However, it is all a hidden function to the end, and there is a merit, too and there is a sword of the double-edged blade without fail.

Moreover, in most cases, rather than being able to actually speed up, "experience speed becomes a little better" so there is only an effect of about, it does not make much sense to change the setting.

Reinstalling bookmarks and extensions

If you create a new user or reinstall Chrome, you'll have to re-enter the extension to get everything back to its initial state.

However, you can easily reconfigure it by logging in to your Google account from Chrome and syncing it on multiple Chrome "users" devices.

Unfortunately, you have to manually transfer the data to the extension settings, so you need to copy the contents of the following folders together to the new user folder.

[For Windows 10]
C:Users@OS usernameAppDataLocalGoogleChromeUser DataDefaultExtensions

If you are switching Chrome users, the Default part is "Profile 1", "Profile 2"… Should have been.


Posted by takasho