Diagnose Screen Capture Slowdown Issue

I’m running an app on my Galaxy S25 Ultra. Everything feels snappy until I take a screen capture; a bit later the whole phone shifts into a sluggish “slow mode.” It isn’t immediate—performance drops only after I’ve continued using the app for some time—so I’m struggling to pin down the trigger and, more importantly, the cure.

What I need from you is a clear, technically sound explanation of why this delayed slowdown happens and a practical, step-by-step plan to resolve it. Please consider all likely culprits: thermal throttling, memory leaks, power-saving settings, rogue background tasks, or anything else you’ve seen in One UI or Android 15. Point me to any relevant diagnostic menus, Samsung Members logs, or third-party monitoring tools I should install (ADB, Systrace, Galaxy Labs, etc.), and then walk me through the exact steps to test and fix the problem. If there are known patches or firmware updates, link them. If a setting tweak is enough, spell it out.

Deliverables
• Brief root-cause analysis written in plain language
• Detailed troubleshooting checklist I can follow on the S25 Ultra
• Recommended permanent fix (settings change, update path, or app-side adjustment)
• Optional: concise video or annotated screenshots that demonstrate each step

I’ll verify the solution by reproducing the issue and confirming that performance no longer degrades after a fresh screen capture plus extended use.