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Python isn't really the best language to use since it is slow enough to introduce measurable latency when you have some
degree of load from actions/highlights/triggers etc.

The only time I've had issues with this in python3+ is when it was poorly designed logic - using newer versions of python (3.x+) haven't really had performance issues for anything network constrained - the only time I've ran into performance problems that were noticeable were IO or memory constrained work like reading and processing large files, etc.

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Your msg handler doesn't match prompts. Matching prompts is the fundamental operation that has to
be correct in every MUD client, otherwise you can't do reliable per-line operations (like actions/triggers/highlights etc).
You need to take into account that server output can arrive in batches that are completely arbitrary / not neatly
terminated by a complete prompt or even new line.

I'll have to add a new layer for this - I've been starting to see issues with it occasionally during that interrupt period in between receiving - but I think I should be able to solve this relatively easy with a bit of thought. More context on the prompt thing would be helpful - I haven't ever really gotten into the scripting stuff via zmud and mud (Mostly just color triggers, eat/drink, and some aliases for targeting and shortcuts). Is the prompt recognition just used to segregate the "events" that have happened when you're scripting things out?

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This doesn't work because regular expressions can not be used to model state machines, which is really what you need here.

I didn't realize it, but the only reason it's working right now is because it's not often that you hit a color change mid-message (Most of the message colors are already reset by the time you get to another message/line). I'll have to think of a good color state system - that's great input, thanks!

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Making something that sort-of-works, some of the time, is easy.

But making something that's robust is all about understanding the problem and its cornercases

Would love more feedback - it's been really fun to learn the ins and outs of writing a MUD client, and I'll likely be poking at this for a few years, since I use it fairly consistently right now to play casual stuff.