I assume this is why TSE suddenly became so slow.
in your working directory.
When I checked it showed that this file had grown /is growing towards 1 gigabytes:
17/11/2022 04:14 671.476.529 tseblock.dat
That started slowed TSE extremely down, with a file size that had a large impact on TSE thus.
As stated I have autoloaded blocks.s many months, since it was published, so on my TSE system
it started to manifest itself thus as the file kept growing.
So for now it is absolutely advised to not use this blocks.s macro at all.
(troubleshooting included switching off anti-virus programs and excluding the TSE folder, restart computer, restart TSE, testing other TSE versions, purging macros, ...)