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Proxy is extremly slow, active scan failed

Jan | Last updated: Apr 05, 2022 12:50PM UTC

Hi, I using Burp Pro but since last week is proxy extremly slow and sometimes didnt load page properl. Error Faild to connect. But if I tryed other browser (non proxy through to burp) them page load fast and sucess. Active scan end with error all time. Faild to connect. The page loading problem only occurs via Burp. So I am not able to test the page at all. I also tried OWASP ZAP and it works fine. Here is video record https://viaviscz-my.sharepoint.com/:v:/g/personal/jan_bonczek_viavis_cz/EQ4_r39zmbxMvKhUfumieKcBdtLeU2ds1NomNGMCTdinUQ?email=jan.bonczek%40viavis.cz

Liam, PortSwigger Agent | Last updated: Apr 05, 2022 01:11PM UTC

Hi Jan. That link prompts us to enter a password for your account. Could you send me your diagnostics information? You can find this by going to "Help > Diagnostics" within Burp. Is the application public facing? If so, could you provide the address? You can email us via support@portswigger.net.

Jan | Last updated: Apr 08, 2022 07:00AM UTC

I replyed to the e-mail.

Richard | Last updated: Jun 13, 2022 09:54AM UTC

I can confirm this issue. It's happened since a recent update... Since seeing one of the user's comments to remove extensions. I loaded up burp suite and removed ALL extensions and re-scanned on "https://ginandjuice.shop/" Now requests are FLYING through at the normal rate expected and not 1-2 requests a minute.. So this is an issue with an extension and the latest update. It would be great for the team to test before updates are sent out. QA testing would be beneficial in-house.

Richard | Last updated: Jun 13, 2022 10:02AM UTC

To update, Removing ALL the plugins and manually adding them all back has resolved the slow issue. My initial thoughts are a possible issue in the update/upgrade process which breaks some compatibility in requests in Burp Pro. Speed has returned to normal after the manual removal and re-add. Product Improvement Request: Have the ability to save plugins and reload/refresh all at once.

Liam, PortSwigger Agent | Last updated: Jun 13, 2022 01:37PM UTC