We have a lot of users accessing our CRM on iPad and other platforms without any issues of slowness. 

It very much sounds like an Apple issue not a CRM issue.  You could try pressing Command R to refresh the cache just in case it is a reloading of page issue.  

Here are a couple of links on the Apple discussion forum describing slowness for iPad 3  - they seem to be suggesting could be to do with battery drain:



We would suggest you contact Apple Support direct which in the UK is: 0800 048 0408 as they should be able to shed further light on what is causing this issue.