Lag when landing into EGNT

Hi all

I have just flown back from HESH to EGNT on vatsim. 

When arriving into EGNT at night time all of a sudden my 737 ngx vc went very laggy when looking around with hatswitch. 

My sim was showing 21-30 FPS

I had ftx global vector on with night lighting.

Is there any fix for this ?

Here is pic from gate at EGNT after landing 

http://i.imgur.com/Z7imFlp.jpg

My friend also flew the same route in the ngx with same specs but he had no lag 

Thanks