The new progressbar flickers badly

[bjorn3]

Verification

• I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue and found no duplicates.
• I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and am still able to reproduce my issue.

Problem

When there are multiple progressbars being updated at the same time, there is heavy flickering when using Konsole.

Steps

1. rustup update

Possible Solution(s)

Reduce update interval to at most twice every second and/or use the synchronized update escape codes: https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec

Notes

No response

Rustup version

rustup 1.29.0 (28d1352db 2026-03-05)

Installed toolchains

Not relevant

OS version

Linux

[rami3l]

@bjorn3 Thanks for reporting! I think @djc has lowered the tickrate to 20 per second in #4602... Would you mind testing a little bit on your side by editing that value to see how low we could go without making the animation super laggy?

Or, alternatively, maybe we can add an env var to tweak that value?

[djc]

Or, alternatively, maybe we can add an env var to tweak that value?

Pff, let's not go there for this. Adding more configuration surface does not make things better in the grand scheme of things, it just requires users to build more expertise.