performance-tools

Trace files are big and compress really well, 5x-ish in my experience. Could magic-trace write out compressed traces instead of raw traces?

Perfetto already has support for loading gzipped traces. But gzip is really slow (fingers crossed for Sapphire Rapids, but that's years from being commonplace).

As far as I can tell, we have two options here:

• teach magic-trace to write gzipped trace

In jlfwong/speedscope#188, I introduced TextDecoder as a way of avoiding performance issues with building up a huge string slowly. There are ways to make the fallback path faster and use less memory as well:

From @evanw:

The problem is that JavaScript JITs such as V8 optimize repeated string appends by building up a linked list in memory and only constructing the