Dev Tools · 2h ago
PostHog rewrites SQL parser, achieves 70x speed boost
PostHog rebuilt its SQL parser, achieving a 70x performance improvement without deep code changes. The rewrite optimized query handling for the company's product analytics platform. The new parser reduces latency and resource usage significantly.
Meridian48 take
The 70x figure is impressive, but the 'barely looking at the code' framing understates the engineering effort behind the optimization.
Read the full reporting
I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code →
Hacker News
sql-parserperformance-optimization