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7fae78d2b0
There was a redundant work in split_fragmented(): value_length_if_fixed() was called inside the loop (N virtual calls), and no reserve() was done on the output vector causing repeated reallocations. This patch reserves the output vector to _dimension and caches value_length_if_fixed() before the loop. Additionally, split read_vector_element() into two specialized functions: read_vector_element_fixed() and read_vector_element_variable(), and hoist the branch on fixed_len outside the loop in split_fragmented() and deserialize_loop(). This avoids a conditional branch per element in the hot path. Benchmark results (1024-dim float vector, release build, -O3 -flto): 10.34 us -> 7.45 us (1.39x, 28% faster)