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This makes quite a bit of difference: For Gemma2-2b PP-8192 is 228 t/s with quantized K*Q vs 178 t/s when converting things to fp16 and using fp16 matrix multiplication. We have PP-512 = 307 t/s, so PP-8192 is now ~75% of the performance of PP-512. In contrast, llama.cpp with Q8_0 cache is 38% of PP-512.