Jakob is on the right track, having large number of Characters + a complex Character Sheet is likely to be a factor. In Mal's case, 5E Shaped sheet, across how many Characters? GM can "Archive" some Characters and this might help, and this is probably the first recommendation to try. Wiki: <a href="https://wiki.roll20.net/Journal#Bio_.26_Info_Tab" rel="nofollow">https://wiki.roll20.net/Journal#Bio_.26_Info_Tab</a> Undesirable solutions: Delete some characters, or change to a more simple Character Sheet with fewer attributes, or remake some of the characters under Journals as Handouts instead (so they won't have a character sheet.. also won't have a token). Ever-ready solutions: I will be happy to provide the standard troubleshooting steps for technical issues if you want to try that. The first step is to clear your browser cache periodically as this can help browser performance. To answer something Mal asked: Archived Pages (even unloaded map pages that are in the page toolbar) should not be a major factor in most cases, they don't load the page content until you're on the page so it is only the map thumbnails and titles that are adding a tiny amount to your page load at any given time. Even if the page toolbar was loading dozens of map thumbnails for the GM, it would only be a factor for the GM, because Players don't even load the Page toolbar at all and their computer only needs to load/render the page that they are on. Mal you mentioned dynamic lighting, the DL on the archived or unloaded pages is not a big factor, but the DL on the currently-loaded page can certainly affect performance. To test this just turn off the DL on the page where you experienced slow performance, reload page without DL and observe whether the slow performance still persists. If you find DL is the reason, there are tips for making streamlined DL or switch to just Fog Of War. Wiki of this: <a href="https://wiki.roll20.net/Dynamic_Lighting#How_to_Ad" rel="nofollow">https://wiki.roll20.net/Dynamic_Lighting#How_to_Ad</a>...