Hi,
Please make sure you take proper backup before.
For Ajax please follow below steps.
1. Go to C:\ProgramData\QlikTech\QlikViewServer\Settings.ini in Server Machine where QlikView Server is installed.
2. Add "slowprinting=1" under [Settings 7] like below.You will just add 1 line highlighted below in bold.
[Settings 7]
slowprinting=1
DocumentDirectory=........
Let Me know if that worked.
Regards
ASHFAQ