Fix plugin download timeouts by using low-speed timeout instead of hard timeout

[bcotrim]

Related issues

• Fixes STU-858

Proposed Changes

• Replaced hard CURLOPT_TIMEOUT (30s) with low-speed timeout to allow large plugin downloads
• Set CURLOPT_LOW_SPEED_LIMIT to 1KB/s and CURLOPT_LOW_SPEED_TIME to 30s in the HTTP request timeout mu-plugin
• Kept overall timeout at 300s timeout
• Updated both src/lib/wordpress-provider/playground-cli/mu-plugins.ts and vendor/wp-now/src/wp-now.ts
• This allows large downloads (like Jetpack at 33MB) to complete while still failing fast on stalled connections

Testing Instructions

• Install Network Link Conditioner (from Apple's Additional Tools for Xcode)
• Set throttling to a slow profile (e.g., "3G" or "Edge")
• In Studio, navigate to /wp-admin/plugin-install.php
• Try installing Jetpack plugin (33MB)
• Expected: Should complete successfully even on throttled connection (may take several minutes)
• With the old 30s timeout, this would fail with "Operation timed out after 30014 milliseconds"
• Optionally verify with normal internet by turning off Network Link Conditioner and installing Jetpack - should complete quickly without any timeout issues

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[github-actions]

📊 Performance Test Results

Comparing 301c1f8 vs trunk

site-editor

Metric	trunk	301c1f8	Diff	Change
load	11376.00 ms	8926.00 ms	-2450.00 ms	🟢 -21.5%

site-startup

Metric	trunk	301c1f8	Diff	Change
siteCreation	12074.00 ms	11050.00 ms	-1024.00 ms	🟢 -8.5%
siteStartup	3948.00 ms	3929.00 ms	-19.00 ms	🟢 -0.5%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change

[ivan-ottinger]

Nice! The changes look good and I can confirm they fix the issue when installing Jetpack on DSL speeds. If I tested with slower connection (e.g. 3G or EDGE), it failed as with the current trunk.

Install Network Link Conditioner (from Apple's Additional Tools for Xcode)

This took me a bit longer to figure our where to find the tool so I am linking it here - if anyone else would like to use it:
https://developer.apple.com/download/all/?q=Additional%20Tools

It is bundled inside Additional Tools and I found the tool quite buggy. For instance, my Preferences crashed multiple times and it was necessary to force-close it.

[epeicher]

Thanks @bcotrim for improving this! I have tested it with DSL connection and while it was failing in Production, it has worked using this branch. Changes also LGTM!

Speed	Production version	This branch