textarea horrible performance with a lot of text

**Describe the bug**
`textarea` renders all the text on every update, causing unreasonable performance issues

**Setup**
Please complete the following information along with version numbers, if applicable.
- OS [e.g. Ubuntu, macOS]
- Shell [e.g. zsh, fish]
- Terminal Emulator [e.g. kitty, iterm]
- Terminal Multiplexer [e.g. tmux]
- Locale [e.g. en_US.UTF-8, zh_CN.UTF-8, etc.]

doesnt matter

**To Reproduce**
Load a textarea and fill it with a lot of text

**Source Code**
Please include source code if needed to reproduce the behavior.

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
Add screenshots to help explain your problem.

**Additional context**
Add any other context about the problem here.

No implementation file or test is identified. Start by locating the textarea component and reproducing the issue with a large text value; profile an update to confirm the rendering cost. Done means large text updates no longer render all text on every update and the textarea remains responsive.

Written by the indexing model from the issue text.