SDL trados studio 2017 very,very slow

This version of Studio is very, very slow on my machine. I am using AVG Zen for internet security.

Studio hangs, doesn't respond and takes forever to confirm a segment.

Can anyone offer any advice on what I might try to make it perform better? I am running Windows 8.1 (64-bit) on a Lenovo laptop (roughly 18 months old).

Processor 2.19 GHz and RAM 12GB

Many thanks in advance,

Katherine