I've uploaded a small update v3.1, +5% speed for 290/290X, so CPD for these cards is about 2.5 now. For other cards probably you will see even less improvement, so just wait for better update
After 27 minutes of not looking for blocks
R9 290X Tri-x
miner v3.1
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Wed Apr 23 22:38:14 2014
New Block: 507483 - Current Diff: 10.816298
Total/Valid blocks: [ 0 / 0 ] - Max diff: 8.916014
[ 4ch] [ 7ch] [ 8ch] [ 9ch] [ 10ch] [ 11ch] [ 12ch]
Total: [ 93K] [ 58] [ 4] [ 0] [ 0] [ 0] [ 0]
ch/h: [ 200552] [124.564] [ 8.591] [ 0.000] [ 0.000] [ 0.000] [ 0.000]
Estimated CPD: 2.1477, Average CPD: 0.0000, Mining time: 00:27
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sieve: 128, fermat: 2, total: 136 Total Round Time (TRT): 136
sieve: 128, fermat: 1, total: 136 Total Round Time (TRT): 136
sieve: 128, fermat: 2, total: 137 Total Round Time (TRT): 137
sieve: 128, fermat: 2, total: 137 Total Round Time (TRT): 137
sieve: 128, fermat: 2, total: 137 Total Round Time (TRT): 137
sieve: 128, fermat: 2, total: 138 Total Round Time (TRT): 138
sieve: 128, fermat: 2, total: 136 Total Round Time (TRT): 136
sieve: 128, fermat: 2, total: 137 Total Round Time (TRT): 137
sieve: 128, fermat: 2, total: 137 Total Round Time (TRT): 137