Using the right Browser, making sure you and the other players have Hardware Acceleration enabled / on and the DM’s assets & setup of the game are the most major performance hitters for Roll20.
1. Browsers For Roll20
There are three I would recommend, even if these are not your preferred browser, it is very useful at times with Roll20’s buggy nature to have a secondary browser to boot into with and troubleshoot problems if they happen.
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- Google Chrome: The generally least buggy browser to play Roll20 with, but at times with specific things in some updates that roll out, Firefox is better.
- Firefox: Second best option, at times with updates that roll out this is the first option, but between Firefox and Google Chrome, you should be able to have a good experience.
- Brave (Chromium): My preferred browser, it works just fine although at times there are some bugs, I switch to one of the above and do a cache clear if I have issues. Although I am able to use it 99% of the time.
2. Hardware Acceleration
Hardware Acceleration is a CRUCIAL thing to have enabled in your Browser for Roll20. Here is how you do so and check if you have it enabled or not.
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1. Go to the upper right and go to Settings:
2. Scroll to the very bottom and go into Advanced: 
3. Find somewhere in the System section, the option titled “Use hardware acceleration when available.” Or such, all the browsers are similar and make sure it is enabled:
3. DM Assets & Notes
There are a few things that a DM can do that can REALLY mess up Roll20 Performance for everyone. Here are some tips and things to avoid doing:
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Compress Your Map Assets!
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Yes, super high-detailed maps are cool, big maps are cool. But irregardless of the map and it’s quality, the DM should be compressing them down as much as they can and this goes for a lot of assets outside the map as well. This is easily done with Gimp or any other image editing software. Go low, go slow. A lot of the time you can compress assets down over half their size and lose little if any detail.
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Beware Dynamic Lighting (Paintbrush):
If you use dynamic lighting in Roll20, beware using the Brush tool on the dynamic lighting layer. This creates a LOT of calculations that Roll20 will attempt to do, always use the Polygon tool and never the Brush. Dynamic lighting also hates round lighting, always try to boxify or simplify. — Simplify that lighting for the love of god!
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Compress your Jukebox Tracks!
I have had nothing but issues with the Jukebox in Roll20, it’s just downright offensively bad. But it’s still very useful, just make sure to compress your audio down just like your assets, this can be done in Audacity or any DAW Audio Program of your choice, there are also online converters. Try to aim for file sizes of 2.5mb or less, note this takes special care track to track to ensure quality, but also to compress them down below this bar. Also, keep your tracks either fully yourself-uploaded or the provided links/integration to Battlebard, etc. It seems to absolutely hate to load one into the other. But outside it’s buggy nature, this can also if you go too overboard with data, mess with Roll20.
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Don’t overload the system, man:
IE: Those 200 character sheets from dead characters. IE: Those hundreds of uploaded assets you haven’t used in 2 years. This is primarily just a tip in general, load them all on Roll20 and make use of the folder system to it’s maximum. Archiving items for later is another great thing to do as it makes it a non-load for your browser, although again, beware possible performance impacts on over-hoarding in the Roll20 UI. Compress, Store, Pull it out of the bag when it’s needed. Mostly a tip for those with thousands upon thousands of assets.
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