Very happy to hear you're enjoying the game!
So, this is a known issue. Certain maps have a -lot- of events on them, and those can be very hard on weaker CPUs. I'm working on an anti-lag fix, but it has a few more bugs I need to iron out. You can get a beta version of it on the Steam version for now, if you want to. I'll be bringing it to the main version of the game soon, but I'm currently waist deep in the next update and can't really stop and iron it out right now.
There are only 3 known issue spots where it breaks, though, and those can be avoided by swapping back to the non-anti-lag version, if you want to use it in the meantime. I'm willing to upload a version of the antilag beta here on itch if there's interest.