Interface vs pure abstract class - speed.

[SundayMorningRunner]

Hello, let's say I have the choice between using an abstract 
class or an interface to declare a "plan", a "template" for the 
descendants.

From the dmd compiler point of view, should I use the abstract 
class version (so I guess that for each method call, there will 
be a few MOV, in order to extract the relative address from the 
vmt before a CALL) or the interface version (are the CALL 
directly performed in this case). Are interface faster ? (to get 
the address used by the CALL).

Thx.