Slow running fm15

[Ryan2926]

Hi guys,
was wondering if any one can help me out just brought new laptop and fm15 and when started playing it was all fine but now got bit lagging and slow and don't know why that is my laptop spec is

acer aspire e15
intel core i5-4210u 1.7ghz with turbo boost up to 2.7ghz
intel hd graphics 4400
4gb ram
1000gb hdd

any help would be greatfull thanks Ryan