I found one dumb free win (I mistakenly used value receivers on a utility function called on a large struct thousands of times a frame). But the rest of the speedups I found took more effort.
Scan the crate to find areas of algorithmic weaknesses in extreme cases, and write a sentence for each describing the problem, the potential solution, and quantifying the impact of the solution
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So Squire and his colleagues began sending photos of these houses to John Harp, the brick expert.
Nearly every protection-related instruction -- far CALL, far JMP, far RET, INT, IRET, MOV to segment register, task switch -- needs to load a segment descriptor from the GDT or LDT. The 386 microcode centralizes this into a shared subroutine called LD_DESCRIPTOR, which reads the 8-byte descriptor from memory and feeds the high DWORD (containing Type, DPL, S, and P bits) to the Test PLA for validation.