So, now you know how your site performs, what do you do about it? Here is a collection of resources ranging from self-help to commercial solutions that can help you improve the performance of your site (usually quite significantly).

Disclaimer: the commercial services and consultants listed here have all contributed to WebPagetest in some way (usually by running a test location). This isn't an exhaustive list of services available but these are certainly well-vetted experts in their areas and have been working on web performance longer than most people.

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Solution Providers

Automated Site Optimization

These are software, device or services that will automatically apply optimizations to your site

• Akamai ION
• Cloudflare
• Fasterize
• Instart Logic

Website Monitoring

• Catchpoint
• Dotcom-Monitor
• ip-label
• Speedcurve
• Calibre
• Sitespeed.io
• MachMetrics

Misc

• PSW Group (Germany) - Internet security solutions
• Exceda (Brazil) - Akamai CDN and acceleration services
• edgedirector.com - DNS services for global load balancing and failover

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Consultants

• Aaron Peters
• Daemon Solutions
• Sajal Kayan
• Zeroload
• MeasureWorks
• Global Media Systems
• iCOMcept

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Self-Help

If you're comfortable doing the optimizations yourself or are just interested in learning more, these are great places to start

Tools

• Google Page Speed - Firefox extension for analyzing pages and Apache module for automating optimization
• Dynatrace Ajax Edition - IE Browser plugin for analyzing pages and profiling javascript

Discussion Groups:

• WebPagetest Forums
• Make the Web Faster Google group
• Yahoo Exceptional Performance Group

Online Resources:

• Google's Make the Web Faster site
• Yahoo's Exceptional Performance site