<stronghttps://corona-renderer.com/forum/index.php/topic,16722
How is it possible that there is code being executed 100% of the time and the CPU is not fully utilized?
Modern CPUs have many execution units specialized for different tasks. Most applications are able to utilize only some portion of these units at any given time. For example MS Word doesn't need to do much floating point calculations, so the floating point execution units just sit idle when the CPU is running Word. Even if the application was able to keep all the execution units fully utilized, it may not be able to feed them with data fast enough.
Modern CPUs are a few orders of magnitude faster than modern RAM, so when the CPU is able to process the data faster than the memory is able to supply it, the CPU will end up waiting for the data most of the time.
а вообще можно долго гадать почему такое произошло, не зная никаких данных о компе, сборке, винде, версиях софта.
ставлю 500 рублей, на то что у автора слишком старая корона для проца.