How can I troubleshoot slow upload speeds with Cloudflare?

Start by testing your upload speed directly to your origin server to rule out origin issues. Then, test upload speeds with Cloudflare enabled and disabled to compare. Check your Cloudflare DNS settings, especially the proxy status (proxied vs. DNS only), as proxied traffic goes through Cloudflare. Analyze network logs for timeouts or errors. Finally, contact Cloudflare support with diagnostic information, including test results and configuration details.