fix: performance issue caused by the render calls #23
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mactop has high CPU usage. Running it with cpuprofiling shows that the top CPU time is spent in the termui.Render calls (to be specific, in the ioctl syscalls there).
I removed a bunch of unnecessary Render calls (there were some duplicates) and replaced all the other calls with a throttled version: I call Render in the main process but not more often than twice in the single "update interval" period.
This should address issue #13.
P.S. It's my first contribution to the open-source project in a while, but I couldn't walk past 😊