Investigate: Performance impact of @-mention lookups and hashtags on publishing

[pfefferle]

Description

Investigate whether @-mention lookups and hashtag processing are causing slowdowns during the post publishing process.

Background

When publishing posts, the plugin performs:

• Webfinger lookups for @-mentions to resolve actor URLs
• Hashtag processing and formatting
• Both operations may involve network requests or database queries

These operations could potentially:

• Delay post publication
• Cause timeouts on posts with many mentions/tags
• Impact user experience during publishing

Investigation Points

1. @-mention lookups:

   • Measure time for Webfinger resolution per mention
   • Check if lookups happen synchronously during publish
   • Determine impact of multiple mentions in a single post
   • Check if failed lookups cause delays

2. Hashtag processing:

   • Measure time for tag parsing and formatting
   • Check database query performance for tag lookups
   • Determine impact of posts with many hashtags

3. Overall impact:

   • Measure total publishing time with/without mentions and tags
   • Identify any blocking operations
   • Check if operations could be moved to background jobs

Possible Optimizations

If performance issues are found:

• Move Webfinger lookups to background processing
• Cache mention lookups
• Batch process hashtags
• Add configurable timeouts
• Queue federation activities asynchronously

Success Criteria

• Documented performance measurements for mention/hashtag processing
• Identified bottlenecks (if any)
• Recommendations for optimization (if needed)