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Found the problem not 10 minutes after making the post. I wasn't rebuilding the system libraries fully. Increasing TICKS_PER_SECOND decreased the delay in OSUnlock.

I'm having a bit of an issue where I get 40ms+ delay after using the NB libraries to write to the serial port.

Part of the relevant code:

sim.gpt[0].port = 0;
serwriteaddress(fd, 0xE5);
//No delay
serwriteaddress(fd, startAddress);

//40ms delay

for(uint16_t i = 0; i < modules.size(); i ...