From my host
This itself isn't the real problem though, which is that the script initiates the ImageMagick "convert" command with specifications that cause CPU utilization for the command to run as high as 1300+% CPU.
16 CPU's on the server so 13+ completely consumed by the processing of one convert process from your site like:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
26413 myaccount 18 0 271m 3624 2164 R 1325.9 0.0 0:07.41 convert
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