[Python] Improve python builder performance #8766
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- Builder startup work is cheaper: StartObject now seeds vtable state with [0] * numfields, lazy create sharedStrings dict to speed up objects with no strings - Offset/Pad/Prep all work off cached head/buffer lengths and zero-fill via slices - Prepend now handles alignment + byte writes in one pass - Vtable write is batched: WriteVtable gathers all field offsets plus metadata and streams them
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Builder startup work is cheaper: StartObject now seeds vtable state with [0] * numfields, lazy create sharedStrings dict to speed up objects with no strings
Offset/Pad/Prep all work off cached head/buffer lengths and zero-fill via slices
Prepend now handles alignment + byte writes in one pass
Vtable write is batched: WriteVtable gathers all field offsets plus metadata and streams them
Performance is 1.6x faster: old time: 63.0 us, new time 39.2 us
before_perf.txt
after_perf.txt