Replace the cartridge in the shower mixer.

Is it just the shower, or does your sink and toilet in the same room do the same?

The pressure drop you describe sounds like the flow is too high. A shower head has to have some restriction in order to make a nice spray. You can try swapping shower heads to see if that's the case. If not, then something is mis-plumbed. Is there a hot water recirculating pump?

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There's a cartridge in the mixer? Is this something I can swap easily? The previous idiots who owned my house did all copper straight to the mixer, didn't attach it to anything behind the wall. So the only thing holding it where it needs to be is the bolts from the actual handle. Pain in the ass.

They seem to be fine. They were a bit low, but I just swapped the sed filter and it fixed the two sinks being a bit low, but didn't do much for the shower.

Didn't even know that a hot water recirculator was a thing, and with how old the house is, I'm betting not.