A game opens with a preparation screen before the menu. Another reaches gameplay quickly but pauses when a new effect first appears. Shader and pipeline preparation can help explain some of these experiences, although it is not the cause of every hitch.
Epic’s explanation of shader stuttering describes compilation and pipeline-state preparation, including the role of precaching. It is an engine-specific technical account, not a guarantee about every game built with that engine.
Give the game’s preparation step a chance
If a title explicitly asks you to wait for shader preparation, follow its instructions before judging performance. Skipping an offered preparation stage may move some work into play, depending on how the game is implemented.
Do not repeatedly delete caches as a routine cure. A cache may exist to avoid repeating work, and rebuilding it can change the next launch. Use the game’s official troubleshooting advice for the particular symptom instead of copying an unrelated forum command.
Record when the hitch happens
Note whether it appears on first entering an area, seeing an effect or starting after an update. Repeat a short, comparable section if practical. Record game version, graphics driver, settings and whether preparation completed.
A second smoother pass is a useful observation, but not proof of one cause. Asset loading, storage, background tasks and other factors can also vary between runs. Keep the observation separate from the explanation you suspect.
If reporting a problem, include a concise sequence that reproduces it. “A pause occurs when this effect appears on the first pass” helps more than “the game is unoptimised.” Avoid changing several settings before collecting a baseline.
Let official updates and support guidance inform the next step. Understanding preparation gives you a better question to ask; it does not turn every momentary slowdown into a reason to replace hardware.