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1.- Every repeated cache-served-image is decoded. The patch adds
an extra reference to the dicache entry, so only one of them is
decoded, and the imgbuf deletion is left to a_Dicache_cleanup.
2.- Every repeated cache-served-image call copyRow for each row.
The patch avoids that.
This is common with small images (e.g. bullets), but the
overhead may be not worth the patch...
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