EndNote x7 ridiculously slow

I have been using EndNote x7 trial on my Mac for 20 days. Everything was perfect at the beginning but since I starting piling up citations, it is ridiculosuly slow. I have a new MacBook Pro and it works great and fast until I open EndNote. 

It takes around 30 seconds to find a citation and I can work with that, but when I try to paste a citation on my Pages document, I counted 7 minutes until it finishes it and I can go to the next one. That means 8 citations an hour aprox.

I want to know if it’s normal for EndNote trial or if there is something wrong because I am definitely not purchasing it likw this.

Any suggestions?