First of all are you know these Softwares or tools 1-JavaFX 2- J2EE 3-HIbernate 4- Sprint 5- Graidle 6- Clojure 7- SCALA 8- Android 9- Debian 10- java Bean
I will give the list of tools to manage that performance issue 1- LESS (bootstrap contains less files ) 2- Bowerjs (javascript package manager) 3- Gruntjs (you have know at least a JavaScript) if you need a Help for more info contact me , I done this thing before
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I'm a Software Developer for Long time , The Best Start up Language is a JavaScript language, to find courses go to 1- Lynda.com - Search Foundation of Programming - Fundamentals 2- Coursera.org - Search Start up Engineering this Course my gonna Help to get up on your feet