Update 2026-10-09: I extended this renderer for a 71-column iPhone client: compact text stopped duplicated bottom status rows while keeping the desktop colors and widgets. See the Termius on iPhone follow-up.

Two days after the last fix, my tmux was laggy again, and the server was back at about a quarter of a CPU core. The culprit was the same as last time: the status bar’s #() jobs. This time, though, the number of jobs wasn’t the problem. Each one had become slow, because every job is a fork of the whole tmux server and my server had grown to 1.5 GB.

This post covers how I measured it, where the 1.5 GB came from (mostly the scrollback of three panes), and the fixes. One of them corrects a claim in my previous post.

Update 2026-10-02: two days later the lag was back. Each fork of the server had become slow (~30 ms), and one claim below was wrong: passing #{E:#{@quote_cond}} into the job does not work, because tmux does not apply strftime inside a #() command. See round 2.

My tmux had started to feel sluggish. Nothing was broken, it just felt heavy. It turned out the tmux server was using about a third of a CPU core all the time, and nearly all of that went on the status bar. Part of the cost came from the clock workaround in my previous post.

This post covers how I tracked it down, including two wrong guesses, and the fix, which brought the server from ~35% CPU to ~4% without restarting it.

Clash Verge Rev is a desktop GUI for the mihomo proxy core (formerly Clash Meta). It is the maintained fork of the original Clash Verge, which was abandoned in 2023. If a tutorial tells you to use zzzgydi/clash-verge, skip it.

On a modern Ubuntu, installing it takes one command. On my Mint 20.3 (focal, glibc 2.31), the latest .deb would not install, and the failed attempt left apt in a broken state. Unlike Claude Desktop and ChatGPT Desktop, there is no clean way to patch around it this time. The practical fix is to run the last 1.x GUI with an up-to-date core.

我把 Linux 的时区设成 Asia/Tokyo，又手动设置了系统时间，但 tmux 右侧状态栏仍慢一个小时。例如，系统显示 14:37 JST，tmux 却显示 13:37 CST。问题不在 timedatectl set-time：一个早已启动的 tmux server 仍按旧时区格式化状态栏。

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sudo timedatectl set-timezone Asia/Tokyo
sudo timedatectl set-ntp false
# aligned to real Asia/Shanghai time
timedatectl set-time "2026-09-26 15:33:00"

OpenAI shipped an official ChatGPT Desktop for Linux in August 2026 (preview), supporting Ubuntu 24.04/26.04, Debian 13, Fedora 43/44 and Arch. Mint 20.3 (focal, glibc 2.31) is nowhere on that list, so I expected a rerun of the Claude Desktop surgery.

It wasn’t. The glibc floor was fine all along — the package is blocked by three library renames and one optional TPM module. The fix is smaller, and the audit is worth showing because the conclusion is the opposite of last time.

Anthropic’s official Claude Desktop .deb declares libc6 (>= 2.34), which means Ubuntu 22.04+ / Mint 21+. On Mint 20.3 (focal, glibc 2.31) apt refuses to install it. It turns out that dependency is an overstatement, and the app runs fine on glibc 2.31 once you know which three files actually need 2.34.