Large OR query

Hi all

If I have say 1000 values for an ID field, what is the best way to
select from a table all the corresponding records?
I have tried
select * from blah where id in (id1,id2,id3...id1000)
and
select * from blah where id=id1 or id=id2 ... or id=id1000

and both are pretty slow.
Is there a better way to do this please?

Thanks

Ciao
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