Flight 15 LGW to MCO

Hi, has anyone any clue why this flight seems to be late much more than the earlier flight 27. I am booked to travel on VS015 on the 1st May and I have been watching flights for the past few weeks. I realise than there are many reasons for delays but this flight seems to be late quite often. I also checked the route stats at MCO and see that this route only has a 52% on time rating. Cannot do anything about it but I am just curious! 
