Thank you very much for your reply! 🙂
I will install them. Can you tell me which settings are necessary? I am not familiar with these plugins.
I tried W3TotalCashe and it slowed down the site to a first loading time about 9 seconds. The second visit then was super fast.. but.. 9 Seconds for the first time is way too bad. Maybe this is my fault and this is why I am asking for the right settings.
Thank you so much,
iRomeK