8a75b54735
Especially on windows, direct output to `cout` via `<<` is very expensive. Instead, use fmtlib to do all formatting into a no-alloc `fmt::memory_buffer`, and output that with one call to `cout`. timeit utilities are not used much by default, but during development or profiling one often uncomments macros like `DEBUG_TIME` that then enable `SCOPED_TIMER` or `SCOPED_TIMER_AVERAGED`. Having one `SCOPED_TIMER_AVERAGED` inside sequencer `draw_channels`, with empty timeline and all default channels; the overhead in % of `draw_channels` duration of said scoped timer before and after this change: - Windows: 29% -> 5% - Mac: 5.0% -> 4.4% Pull Request: https://projects.blender.org/blender/blender/pulls/115233
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