Compare browser speed with a VPN on

You turn on a VPN, run a speed test, and get very different results in two browsers. That can happen even when you use the same computer and Wi-Fi. A browser may use a different VPN route, extensions may change traffic, or the test may simply catch a temporary network change.

Use the Speed Test to compare download speed, upload speed, ping, and jitter under matching conditions. The goal is to find out whether the difference follows one browser, the VPN, or the connection itself.

Compare speed in both browsers

1. Choose two browsers and open the Speed Test in both. Use the same computer and the same network for each test.
2. Turn on the VPN and confirm that it is connected. If your VPN is a browser extension, make sure it is enabled in the browser you are testing. A browser extension may only route traffic from that one browser.
3. Run the test in the first browser. Note the download speed, upload speed, ping, and jitter, then run it in the second browser.
4. Repeat the two tests in the same order once or twice. Keep other downloads, video streams, and large uploads stopped, and avoid running both tests at the same time.

Record whether the VPN is a full-device app or a browser extension, and note the time of each test. This helps explain a difference that appears only in one browser or only during a busy period.

What the results mean

One browser is consistently slower

If one browser is slower across repeated tests, check whether it has a VPN extension, proxy setting, or other network extension that the second browser does not. Extensions can change the route or add processing. Browser privacy settings, background tabs, and other add-ons can also affect a test, so the result does not by itself prove that the browser is defective.

Both browsers are slower with the VPN on

A VPN adds an encrypted route between your device and a VPN server. That route can add delay, and the server or route may have less available capacity than your normal connection. A lower download or upload result with the VPN on is not automatically a fault. Compare repeated results with the VPN off, then on again, using the same browsers and test method.

Results change a lot between runs

Internet traffic changes from moment to moment. Other devices may be using the connection, the VPN may be switching routes, or a background task may be transferring data. Ping measures response time, while jitter indicates how much that response time varies. A brief speed test is a snapshot, not a guarantee of performance throughout the day.

Speed is similar, but ping or jitter is higher

Download and upload capacity can look fine while interactive tasks still feel delayed. Higher ping means responses take longer to return. Higher jitter means response timing is less steady, which can affect calls and online games. The VPN route may add delay even if the measured download speed remains close to normal.

How to narrow down the cause

1. Repeat the comparison under the same conditions. Keep the device in one place, use the same Wi-Fi or Ethernet connection, and test one browser at a time. Stop large downloads and uploads, and close video streams. If the results become closer, competing network traffic may have affected the first comparison.
2. Check how the VPN reaches each browser. A full-device VPN app usually covers traffic from both browsers. A browser VPN extension may cover only the browser where it is installed. Check the VPN app or extension's connected status in each browser, and look for split tunneling or app-specific routing options.
3. Check proxy settings. On Windows 11, open Settings › Network & internet › Proxy. On macOS, open System Settings › Network, select your active connection, then open Details › Proxies. Make sure an old or manually configured proxy is not affecting only one browser. Do not remove a proxy that your workplace or school requires.
4. Temporarily check other extensions. Keep the VPN extension enabled if it is how that browser connects, but turn off unrelated extensions for a comparison. Then repeat the test. If the result changes, re-enable extensions one at a time to identify which one affects the connection.
5. Compare the VPN with a direct connection. Run the test in each browser with the VPN off, then repeat with it on. If both browsers slow down similarly only when the VPN is active, the VPN route is a more likely cause than one browser. Reconnect to the VPN or try another server location if your VPN offers that choice.
6. Restart the browser and VPN connection. Close and reopen the browser, disconnect and reconnect the VPN, then test again. If only one browser still differs, update it and check for managed browser settings or extensions installed by an administrator.

Why browser comparisons can mislead

A speed test uses your browser to exchange test data with a server, so the result reflects more than the internet plan. The browser, VPN route, server load, device workload, and other network traffic can all affect the reading. Run tests close together and compare patterns across repeated runs rather than treating one number as conclusive.

A speed result also cannot confirm that your VPN is protecting all traffic or that your real IP address is hidden. If you need to check VPN routing or leaks, use a dedicated VPN leak check, not download speed as a substitute.

The Speed Test exchanges test data with TooLab's server to measure the connection. Avoid sharing screenshots of results if they include network details you would rather keep private.