Why the first load is slow and every one after is fast
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A question that comes up a lot: "the first time I load a model it takes a while, then it's instant. Why?"
The engine compiles small GPU programs (shaders) for your specific hardware the first time it runs. That compile used to happen on every load, which meant waiting a minute or more each time.
Those compiled shaders are now written to disk and reused. So:
- First ever load on this machine: a few seconds of compiling.
- Every load after: near-instant, including different models and after a reboot.
If your first load is still slow every single time, that's worth reporting — it usually means the cache directory isn't writable.
How long does a load take on your setup, cold vs. warm?
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