metaclasses and performance

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Hi, could one of the developers possibly answer a question for me?

Q:  In SBCL, what operations are likely to be slower, even if only
slightly, when using a metaclass instead of standard-class?

I have an application for classes which is particularly
performance sensitive that I want to keep optimized, and would like to use
a metaclass to add certain metadata to the mix.  I suppose I could use a
class allocated slot, which actually brings me to another question (that I
could probably just try!) but I'll ask anyway:

Q: If I have class allocated slots on a class and they have initforms, but
instead of running the make-instance machinery, I use allocate-instance to
create them instead of something that will run shared-initialize, will the
class allocated slots be filled?

Thanks!

-AKW

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<div dir=3D"ltr">Hi, could one of the developers possibly answer a question=
 for me?<div><br></div><div>Q:=C2=A0 In SBCL, what operations are likely to=
 be slower, even if only slightly, when using a metaclass instead of standa=
rd-class?</div><div><br></div><div>I have an application for classes which =
is particularly performance=C2=A0sensitive that I want to keep optimized, a=
nd would like to use a metaclass to add certain metadata to the mix.=C2=A0 =
I suppose I could use a class allocated slot, which actually brings me to a=
nother question (that I could probably=C2=A0just try!) but I&#39;ll ask any=
way:</div><div><br></div><div>Q: If I have class allocated slots on a class=
 and they have initforms, but instead of running the make-instance machiner=
y, I use allocate-instance to create them instead of something that will ru=
n shared-initialize, will the class allocated slots be filled?</div><div><b=
r></div><div>Thanks!</div><div><br></div><div>-AKW</div></div>

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