re-enable profiler

docs/check_performance/README.md

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+# Check performance
+
+1. Go to settings, scroll to the very end, and enable the "Enable Profiler" option.
+2. Also enable "Enable Profiler Printing".
+3. Check Console Output (directly or via `vConsole` plugin). More details are [here](../how_to_debug/README.md).
+4. Sync!
+5. You can also "Export Profiler Results" afterwards. A new file `_debug_remotely_save/profiler_results_exported_on_xxxx.md` will be generated.
+
+In the console or exported files, you can see the time cost of each steps.
+
+![profiler settings](./profiler_settings.png)
+
+![profiler exported](./profiler_exported.png)

docs/check_performance/profiler_exported.png

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+size 265289

docs/check_performance/profiler_settings.png

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