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e.g. opencode right now uses ~80% of my CPU.

At first I also thought that it would be just call and wait, but a lot of work is done locally (any tool calls).

It's also dealing with memory issues (see: Memory Megathread https://github.com/anomalyco/opencode/issues/20695).

And in my experience is not that much faster to start than more complex software like Visual Studio Code.