With a huge range of features included out-of-the-box and over 13 000+ additional extensions available to download
Native Lazyload
FREE
OptiPic images optimization and WebP convertion
Buslik Cache Lite v1.0.15.20
OpenCart Optimization as per Google PageSpeed In..
WebP Images
Memcached Speed Booster
Lightning - Cache, Optimization, SEO and Google ..
Module Caching PRO
Opencart Turbo. Advanced Cacher. Lite. v1.2
fasterfox for opencart - speed web pages
Image Compress with Squeezeimg (support v. 1.5-3..