Hi @Ganga
QuickSight only keeps the visuals for the sheet that is currently visible in browser memory.
If the author turns on Edit → Analysis Settings → “Reload visuals every time I switch sheets”, the engine will deliberately re‑query and re‑draw every visual each time you change tabs, which is exactly the behavior you’re seeing.
With that toggle off (the default), a sheet stays cached for about 30 minutes, jumping away and back is instant because QuickSight serves the stored result instead of re‑querying.
Please refer to the below documentations this might be helpful for you.