Crystal report very slow

Hi,

I have a big crystal report (640k) connecting lotus notes database. It have been developed with Crystal report 11.5.12.183 and lotus notes 9. Normally this report take 5-6 secondes to execute, but when I just add another database field on this report, the report take more than 3 minutes to execute. Have you an idea why ?

I installed crystal report 2013 on my computer and it take always more than 3 minutes to execute.

Should I desinstalled the older version of crystal report to really test this report with the new version ?

Thank's