[megous]

No. Fetching pages from remote server will just make the client wait for I/O. That takes 0 CPU load and if the server can't respond at 60fps, lowered redrawing frequency would mean even less CPU load from the terminal redrawing itself.

This does not explain 100% CPU load these harnesses sometimes exhibit.

[skydhash]

If it’s localhost, then it’s just the cpu doing stuff as localhost is a pseudodevice.

[megous]

Localhost is irrelevant.