You can follow the steps below to troubleshoot common issues that can make Gmail slow.

Check your browser extensions & Gmail add-ons

Sometimes extensions or add-ons you've installed on your browser and Gmail can slow Gmail. Try temporarily turning off these extensions one by one, then using Gmail again to see if that solves the problem.

Extensions: To disable extensions, you can do this by opening a new tab in Wavebox and visiting chrome://extensions. From here you can enable & disable each extension in turn.

Add-ons: To disable add-ons, open your Gmail Settings and click on the Add-ons tab. From here you can enable & disable each add-on in turn.

Clear your cache & cookies

Try clearing your cache and cookies in Wavebox, then using Gmail again to see if that solves the problem. To do this...

  1. Open Wavebox Settings and select the Profiles tab
  2. Locate the profile that the affected Gmail uses. You can use the Manage apps & groups for each profile button to easily do this
  3. Click the Clear all browsing data for this profile button

Reduce the number of messages on a page

Try reducing the number of messages Gmail shows on a page.

  1. In the top right of Gmail, click Settings & See all settings
  2. Scroll to the Maximum page size setting.
  3. Select the number of messages to show on a page.
  4. At the bottom, click Save Changes.

Disable offline sync

Try disabling offline sync to see if that solves the problem.

  1. In the top right of Gmail, click Settings & See all settings
  2. Click on the Offline tab
  3. Disable offline mail, and click Save changes

Advanced

If none of the above work, there are some advanced tests that may help diagnose the issue

Check the network connect between your computer and Google Mail servers

There are additional steps on Google Support on how to do this...

Troubleshoot slow performance in Gmail - G Suite Admin Help
Advanced tests for administratorsAs an administrator, you can use these advanced troubleshooting steps to diagnose your users’ connections when they complain that Gmail is slow.  Before you begi

Create a performance log

You can create a performance log and snapshot, that you can then send to Wavebox. This may indicate what is causing the slowdown.

It's best to do these steps when Gmail is already exhibiting slow behaviour as it may indicate what is causing this problem. Only run the trace on content you are willing to share, since it is the equivalent of a screen recording.

  • Right click in some blank space in Gmail and then Inspect
  • In the window that opens, click the Performance tab and ensure that the Screenshots and Memory checkboxes are checked
  • Press the record button, in the top left of the window
  • Leaving the window open, in Gmail do some activities that are slow and problematic (note it may be slightly slower whilst the performance tools are running).
  • Once complete, return to the performance tab and press stop to stop the recording. It may take a few moments for the information to be processed and appear
  • Click the Save profile button, which is a few icons along from the record button

Save the file and send it to Wavebox Support. You may need to upload the file to Google Drive or similar.