#5643 Performace issues occurred with following actions

[nilanga Nayanajith]

Version : OrangeHRM 2.6.8/2.6.9

Description :
following operations take more than 3 seconds when there are 4000 candidates in the system.
1. To load candidate list
2. Go to next page of the candidate list
3. Go to the last page from the first page
4. Searching
5. Sorting