Markdown Preview extremely laggy when resizing window with LaTeX formulas

https://github.com/user-attachments/assets/031a93df-73e9-40b7-ac3e-e45ddb8395ca

## Bug Description

When writing Markdown notes with mathematical formulas (LaTeX), performing any of the following operations causes severe lag:

1. **Dragging to resize the preview window**
2. **Frequently opening/closing Claude Code or Copilot sidebar via keyboard shortcuts**, causing the preview window to be repeatedly squeezed/stretched

## Steps to Reproduce

1. Open a Markdown file containing mathematical formulas (LaTeX)
2. Open Markdown Preview (or Markdown Preview Enhanced) pane
3. Drag to resize the window, or frequently toggle sidebar plugins (Claude Code / Copilot)
4. Observe: The preview window becomes extremely laggy, CPU usage spikes

## Expected Behavior

Window resizing should remain smooth without noticeable lag.

## Actual Behavior

- Code editor view (Raw Editor) performs normally
- Markdown Editor extension is acceptable, not very laggy
- **Markdown Preview / Markdown Preview Enhanced is extremely laggy**, especially with many formulas
- **Root cause (suspected)**: Non-code-view preview windows continuously re-render in real-time when the window is being squeezed, which has extremely high performance requirements

## Environment

- VS Code
- Extensions: Markdown Preview Enhanced, Claude Code, Copilot
- OS: Windows 11
- Screen recording: see attached video

---

## 问题描述

在使用 Markdown 编写公式笔记时，对预览窗口进行以下操作会导致严重卡顿：

1. **拖动调整预览窗口大小**
2. **通过快捷键频繁打开/关闭 Claude Code 或 Copilot 侧边栏**，导致预览窗口被反复挤压/拉伸

## 复现步骤

1. 打开包含数学公式（如 LaTeX）的 Markdown 文件
2. 打开 Markdown Preview（或 Markdown Preview Enhanced）预览窗口
3. 拖动调整窗口大小，或频繁切换侧边栏插件（Claude Code / Copilot）
4. 观察：预览窗口出现严重卡顿，CPU 占用飙升

## 预期行为

窗口调整时应保持流畅，不应出现明显卡顿。

## 实际行为

- 代码编辑视图（Raw Editor）表现正常
- Markdown Editor 扩展表现尚可，不太卡
- **Markdown Preview / Markdown Preview Enhanced 非常卡顿**，尤其是公式较多时
- **原因推测**：非代码视图的预览窗口在窗口被挤压时仍在实时重新渲染，对性能要求极高

## 环境信息

- VS Code
- 插件：Markdown Preview Enhanced、Claude Code、Copilot
- 系统：Windows 11
- 录屏：见附件视频