PDFs to slow to open

Hi Guys

So Im trying to open PDFs on my mac and they take along time to load and also to scroll up and down.

Any solutions ?

Model Name: MacBook Pro

Model Identifier: MacBookPro11,3

Processor Name: Intel Core i7

Processor Speed: 2.3 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB

Boot ROM Version: MBP112.0138.B14

SMC Version (system): 2.19f12

MacBook Pro (Retina, 15-inch, Late 2013)