Hi Vizual, Thanks for trying those things. FWIW, I think your best bet is to capture a Console Log ( Chrome , Firefox ) from the time where the freeze occurs, and use it to file a Help Center Request . On the forums, it is most likely to be community support. That being said, there is something going on, but I don't think it is a systemic Roll20 issue. Lag reports are perennial, but always a small proportion of users. I can only suggest things to investigate and ways to winnow out what is not likely to be the culprit. Could you have some security feature at some level that is making it difficult for your computer to access Amazon Web Services? You've narrowed out the browser settings, but you could have something at the firewall level that is gating your access? I have seen a few anecdotal reports of the latest flavor of Windows causing some issues. Do you have another completely different computer you can test on? Like a work computer, or a computer at a library or friends house? That could help rule out anything in your whole ecosystem, and would narrow the problem down to either a game setting or a Roll20 issue. You can rule out anything at the account level by creating a Dummy Account and testing there. You won't have access to a large module game to test with, but there are a number of small free ones (ex. The Master's Vault) if you want to test a campaign with existing assets. In your tests, are you using any Dynamic Lighting? If so, the current system or the legacy system? If current, try turning off Explorer mode. If legacy, try turning off Advanced Fog of War.