Spent an hour or two testing various enhancements to the FPS stuff, and I think I managed to find a nice middleground that seems to run fairly well.

-=-=-

Oddly it's slightly too slow on Firefox, but I'm not sure why.
Whilst Chrome, Safari, Edge Chromium Edition all happily run at the target 30/60fps, Firefox appears to stumble to 25/50fps instead.

It might be a 50/60hz issue, which is weird, because I really wasn't expecting to see that crop up in a browser!
*shrugs*

Meanwhile, I've added Blocklets and Ghosties into Blockman, and the basic AI seems to more or less run as well as can be expected.
Next I need to add collisions, collecting of Blocklets, and then get the door to work properly.
After that, the game's near enough complete.
.. I think!

Woot!