Performance seems to decrease based on number of calls to chalk

[DeltaF1]

In areas with high amounts of coloured tiles, the performance drops significantly (doubly so if the tiles have custom bg values). Creating a large amount of tiles with default colours (i.e. after typing /reset) does not appear to affect performance.

Platform: Windows 10 64-bit Node v10.16.0

[cblgh]

yeah i noticed that as well, things can probably be done way smarter when redrawing lol. i'll have a patching session in the upcoming week or so to try to remedy some of this stuff :)

(it's been toooooo hott these past few days to be inside lol)