1. Your DOM processing take approx 2 sec ( what are you doing in this section )2. Do not include multiple JS files, create client libs and include less files3. Your request in this section is taking too much time (close to 6 sec).Try to optimize codeWhat is the size of data you are getting in these ...

Which AEM version you are using?Have you written code using jsp or sightly?As i said, please use this tool http://www.telerik.com/fiddler to find what exactly is taking time for page load. It could be images, css, html, js, xhr call etc..

1. When are you making XHR call, I mean when does this code loads?2. Make sure you have included all JS at then end on the page not on top. and execute these XHR calls once pages is loaded3. Also use tool like http://www.telerik.com/fiddler to see what section of page is taking too much time to load

Install acs commons on some local AEM instance Then create a package having filters of column control only and its dependencies and install that package in prodlater if you want you can uninstall acs commons package from local aem.

Which eclipse you are using?Did you try to select archetype 10 from the dropdown?

These steps are  well explained hereSetup plugin: http://adobeaemclub.com/aem-eclipse-plugin-setup-tutorial/Create project: http://adobeaemclub.com/how-to-set-up-aem-projects-using-eclipse-plugin/if you face any issue, please share screenshot.

Looks like you need to do a lot of customization:-How and where to store the video files : Store these files in DAMHow to preview the video in RTE? : You need to integrate some available video player in RTE to which you will be passing selected path to video How to define the video size limit : Once...

On top of what @Jitendra and @Scott said,If you do not want to customize the OOTB table component,You can use JavaScript code to add those icons once this component renders on page.Code wont be large and easy to write.

1. Try to activate your page2. Check replication logs while activation3. are you accessing directly publish instance or via dispatcher?4. Is could be that Json response are blocked via dispatcher

You can check/uncheck individual component in group (expand group in design mode dialog )in design modelet me know if am understanding it wrong