Asset download during bootstrap is slow

[johnathan79717]

@spalladino reported that the download of barretenberg-clang20-4143489f79f3d92e.zst sized in 170mb took 170 seconds

Command: build_native
Date: Thu  5 Feb 09:41:12 GMT 2026
Status: 0
Took: 178s

Cache download and extraction of barretenberg-clang20-4143489f79f3d92e.zst complete in 178s.

• Find out why it took that long and whether we can speed it up.
• Consider storing the downloaded assets in a local cache.

[johnathan79717]

Adam has started looking into it. Context: this was from office wifi.

[ludamad]

A CACHE_SSH_HOST workaround was added. Charlie looked into cloudfront