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Profiling the TUI

Build the binary:
```
go build -o opperator ./cmd/app
```
Run the TUI with CPU profiling:
```
./opperator --tui-cpuprofile /tmp/opperator.cpu
```
Exercise the UI, then exit to flush the profile file.
Inspect the capture:
```
go tool pprof -http=:4321 ./opperator /tmp/opperator.cpu
```
Use the web UI (or top/list commands) to find hotspots.