Lucian H. said: Out of interest, (approximately) how do you think the SheetWorkers might be used? I might be able to find some time to help out and I have players who are particularly affected by the weight of the current sheet (magic users with slow computers!). Nice to haves : Things like ammo auto deducting or hit dice automatically deducting 1 from the total or spell usage automatically deducting 1 from the spell slots. Performace auto updates : The goal should be to reduce the total number of attributes. Specifically auto calc attributes. So attributes which then branch out and are used hundreds of places. You'd have to duplicate that functionality with js. So for example if you update dexterity value you'd have to update dexterity mod which would also be used on acrobatics, ac, initiative, on all weapons, on all NPC actions, etc, etc. It's a huge amount of work. A few months ago I looked into implementing it, but found their sheetworkers system to be incredibly hard to be modular. Obviously I'd like to use functions to break down pieces so I can repeat them, but the way it was setup made that practically impossible. The example 13th age sheet they gave was so tiny and done in such a linear fashion that it would be horrendously complicated to implement that model in any bigger sheet. The reason they suggest to replace auto-calc fields is because they loop through every single one when checking for changes. It's crazy. They really should've fixed that model instead of requiring this extra work.. Performance reduce amount of attributes : This should be a big goal as that is the reason the sheet is slow (that plus the recalculating above). This can be somewhat mitigated via changing all areas to repeating, but to do that I need sheetworkers setup to convert the current sheets for all users. That means inventory, weapons, actions, etc. Though as you note I can't do this as roll20 didn't support saving the data of current users and Aaron hasn't gotten around to it (totally understandable). I wondered if it's possible to setup spells in sheetworkers now that 5e has released a SRD, but no idea if roll20 is equipped for that. Honestly it seems like a mountain of a task to work with such a poorly designed system with results that still won't be anything near ideal. That's why I'm entirely unmotivated to fix it. Maybe checking out how the new PF sheet does it would help. Or start a chat with "Chris" who I think is the main contributor.