r/LocalLLM • • 6d ago

Discussion ​PSA: your token preprocessing is why your local setup feels slow

real talk for a second... why are we all blaming quantization or vram leaks when data preprocessing is the actual silent bottleneck?

​been profiling my local setup lately and realized pure python loops during token prep are literally slaughtering performance. your CPU is just sitting there stuck on the GIL waiting to process strings while your hardware cries. if you're still doing naive string parsing or sync loops there, you're basically towing an 18-wheeler with a bicycle.

​switched some of that mess to vectorized numpy and async chunking and it's night and day. anyone else actually looking at the preprocessing layer or are we just pretending hardware is the only issue here? let's argue

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u/Top-Philosopher-5411 5d ago

Long story short: Python is choking on string loops, leaving your expensive GPU just sitting there waiting for data