Magento High Level Optimization
Server (only one is applicable)
- Apache
- NGINX (recommended for large concurrent visitor)
Backend Cache (only one is applicable)
- APC
- Memcache
- Redis (recommended)
Session Store (only one is applicable) - Depends on server technologies
- File Storage (if server use fast SSD) - file storage is recommended
- Session Storage (if server use memcache / redis) - memory base is recommended
Php Accelerator (only one is applicable)
- Zend OPcache (recommended)
- APC
- XCache
Php Technology
Php Fastcgi + HHVM almost same as Php 7 in terms of speed
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Magento Side Optimization
- FPC - Mirasvit Full Page Cache (highly recommended)
- Frontend OPT - Fooman Common & Advanced Speedster (highly recommended)
- Magento Google Pagespeed Optimization Extension (or using server base Mod Page Speed)
- Magento Layout Compiler - (recommended if php cache ie: opcache is enabled)
*Nitrogento (not tested yet)
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Other Gimmicks
- Varnish Reverse Proxy (Highly recommended)
- Google Mod Page Speed (recommended)
- CDN - Content Deliery Network (Cloudflare)
Other Explanations at
https://firebearstudio.com/blog/magento-performance-ultimate-guide-mysql-opcache-cache-cdn-nginx.html