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SQL Query works quickly with 19 items in "IN" clause - much slower with 20. Why?

Author Votes Δ
dcp 9 +3.78
Andomar 9 +1.16
Remus Rusanu 2 +0.16
dnagirl 0 -0.58
OMG Ponies 0 -0.84
yioann 0 -1.62
Sarah Vessels 0 -1.37
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