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# the fix:
@items = grep {
...
             Rate BrowserUk      dpuu
dpuu      10117/s       39%        --
BrowserUk  7289/s        --      -28%

Benchmark: timing 100000 iterations of BrowserUk, dpuu...
 BrowserUk: 10 wallclock secs ( 9.26 usr +  0.00 sys =  9.26 CPU) @ 10
+795.64/s (n=100000)
...
             Rate      dpuu BrowserUk
dpuu      10118/s        --       -6%
BrowserUk 10796/s        7%        --

@items = grep { ++$i && !exists $del{$_} || ($index -= $i-1 <= $index)
+ && 0 } @items;