Default terminal font is too small and changing font size is extremely laggy

[nicobeyond]

Environment

• OS: macOS 26.5 (arm64)
• User: liuishihua
• Wave Terminal version: Client Version 0.14.5 (202604161535)
• Open widget: one local CLI terminal (fish 4.6.0 cod in /Users/gzxworkspace/2026/gzxHrApp2026`

Problem

1. Default terminal font size is too small

   On a high‑DPI display, the default font size is noticeably too small for comfortable daily use.
   Every time after installing / updating, I immediately have to go to settings and increase the font
   size before I can actually work.

   I would strongly prefer the default terminal font size to be at least 14.

2. Changing font size in settings is extremely laggy

   When I try to change the font size (or font family) in the settings UI, the whole app becomes very
   slow and sometimes feels close to frozen:

   • This happens even when the current tab has almost no content, just a local terminal.
   • Dragging the font-size slider or clicking around font settings causes massive UI lag.
   • Because of this, I barely dare to touch the font-related settings once the app is running.

   It feels like every tiny change to the font triggers a very heavy re-render on the whole layout.

Steps to reproduce

1. Open Wave Terminal with the default settings.
2. Open a local terminal (fish 4.6.0 in my case), run some simple command (e.g. codex-cli)
   or even keep the terminal almost empty.
3. Go to Settings → Appearance / Font.
4. Try to:
   • Increase the font size step by step, or
   • Drag the font-size slider, or
   • Change the font family a few times.

Actual behavior

• The UI becomes very laggy while changing the font size.
• Sometimes it feels like the app is almost frozen for a short period.
• This lag happens even when the current tab has almost no output content.

Expected behavior

1. More reasonable default font size

   • Please consider increasing the default terminal font size (suggestion: 14),
     or provide a clear font-size selection step on first launch.
   • Many users likely immediately bump the font up anyway, so having a more readable default
     would improve first‑time experience.

2. Better performance when changing font settings

   • Changing font size / font family should not cause such heavy lag, especially on an almost-empty tab.
   • Ideally, font changes should be batched or only applied to the relevant components, instead of
     forcing a full expensive re-render on every small step.

Impact

This issue significantly affects daily usability:

• The default font makes long sessions tiring.
• The laggy font settings make it painful to tune the appearance to something comfortable.

I would really appreciate it if this could be prioritized in upcoming releases. Thanks!