Increase PROCESS_DELAY throttle window from 50ms to 200ms

[Copilot]

High-frequency cursor updates cause the client to freeze due to an insufficient throttle window. Increasing the delay reduces processing frequency and prevents UI lockups under load.

Changes

• static/js/main.js: PROCESS_DELAY increased from 50 → 200

// Before
const PROCESS_DELAY = 50;    // 50ms throttle window

// After
const PROCESS_DELAY = 200;    // 200ms throttle window

Original prompt

Problem

The client is freezing when there are lots of cursor updates due to the throttle window being too short.

Solution

In the file static/js/main.js, increase the PROCESS_DELAY constant from 50 (50ms) to 200 (200ms) to help reduce the load on the client.

Current code (line 10):

const PROCESS_DELAY = 50;    // 50ms throttle window

Expected code:

const PROCESS_DELAY = 200;    // 200ms throttle window

This change will increase the throttle window, reducing the frequency of cursor trace processing and helping prevent client freezes when there are many simultaneous updates.

This pull request was created from Copilot chat.

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