GET /api/v2/organizations 429 errors at 50 tps

What is the reason the org endpoint throttles so aggressively? Running a basic JMeter script to fetch org details before call setup. Hitting 50 requests per second triggers immediate 429 Too Many Requests responses. The docs suggest higher limits for authenticated users, but the rate limit header resets instantly. Is there a specific cache header I need to respect, or is this a hard cap for standard API keys?