i played on the web build but im not sure if i had any fps issues since i didnt check that. Her speed was just barely enough to dodge komachi's scythe swing.
That doesn't sound right. I tried playing the web build as well, and still have a pretty fast speed that's easily distinguishable between unfocused and focused, you can check the YT clip below. Is your speed close to that?
okay it seems that she moves normally when unfocused, but when she goes focused, she stays slowed down after unfocusing for a while afterwards. Then it gradually gains back its normal speed.