Hi Qamar, Performance issue is not a simple thing and it depends on multiple factors.1. What could be ideal size heap memory for AEM6.4   It depends on mulitple factors.     Total how many users are going to hit your server?     How frequently you are updating content?What is the DAM content size?et...

Check access logs and audit logs, you should see the details something like this, write a simple java code on top of that and get the user from the last 30days based on date field, check below record from access logs. IP Address - UserName 25/Oct/2018:07:47:21 -0400 "GET /bin/publishlistener?

I am not sure, but in AEM 6.4, we need to move all from etc/designs to /apps/settings/wcm/designs/<projetname>, please move to apps and test.

Yes, recently we have migrated one project from 6.3 to 6.4, you need to move etc/designs to this folder "/apps/settings/wcm/designs/<projetname>" "etc/tags" to "/content/cq:tags""etc/clientlibs" to "project specific clientlibs"

I am not sure about sp2 has any translation related code patch or not we need to check release notes. but you can test this in the local environment by installing SP2 and if everything looks good then only push SP2 into upper environments.

Please replicate video to publish environment and check, if still not appearing then clear cache and try.

Yes, the change will not reflect in live copies. you need to manually move live copies. if the count of the live copies pages is less then you can very well use Move option. if the count of pages in thousands then it is better to write custom rollout configuration. the custom rollout action should i...

if you are working in a lower environment then you can use CRXDE to change page names, or you can use Move option which is in Touch UI to rename a page, but it depends on your requirements. you can use "page name after move" field to rename the page name

There is a good article in HelpX on restructuring check itAdobe Experience Manager Help | Common Repository Restructuring in AEM 6.4

In project B, you need to change the configuration in the filter.xml file.ui.apps\src\main\content\META-INF\vault\filter.xmlOpen the filter.xml file and look for  <filter root="/apps/system/install"/> if you see that in project B then this is overriding Project A folder