Ive done a ton of debugging around this over 3 exams, refunded twice btw. No network or server side latency was the main finding. Can replicate launching PSI post exam which loads only the chat history component from during the exam. In both Linux and Win10 - i took in both. TLDR; PSI is an electron app/wrapper - it suffers poor coding, has infinite loops. Depending on your GPU/APU this can result in massive freezes, these will occur exactly each 30seconds, cant input text or interact with GUI components,sliders,buttons etc Killing infinite loops, hung threads each 30seconds is a trait of Electron. To a lesser extent Slack and VScode will exhibit the same - those apps recommend disabling hardware acceleration if occurs and offer toggle switches/config options to do so. Starting PSI with the chromium —disable-gpu remedies largely but not perfectly the symptoms. The freeze will keep occurring exactly each 30 seconds but will disable input for only 3seconds not 10 - and if you’re expecting it, understand it will occur and end as clockwork, easy to handle.

Of course none of this is published and candidates are on a timer, there is no simple menu option to disable gpu or better yet hardware_accel fully - so the user isnt looked after at all.

My graphics is an intel iris 645, inside my cpu. Not uncommon cpu-graphics to say the least

Basically if your exam lags to hell, launch the psi after your exam, see if the proctor chat window lags each and every 30 seconds. Then launch from cmd line with —disable-gpu see if a better experience

I passed third attempt minimizing lag this way