How can I diagnose the cause of slow Cloudflare R2 uploads?

Begin by checking your network connection speed and latency to Cloudflare. Use tools like `ping` or `traceroute` to assess network latency. Monitor upload speeds using network monitoring tools or by measuring the time it takes to upload a large file and calculating the throughput. Review Cloudflare's status page for any reported incidents affecting R2. Examine your code or upload script for inefficiencies in data handling or concurrency. Enable detailed logging within your upload process to track timings of each step.