I've found "demanding", but I'm not sure if it sounds natural when talking about computers..

  • So you mean the program uses a lot of memory? Or that the program is slow to load, "Run at high load" doesn't sound right to me. – Lambie Nov 21 '18 at 14:52

You could say that it's CPU-bound.

From Wikipedia:

In computer science, a computer is CPU-bound (or compute-bound) when the time for it to complete a task is determined principally by the speed of the central processor: processor utilization is high, perhaps at 100% usage for many seconds or minutes. Interrupts generated by peripherals may be processed slowly, or indefinitely delayed.

An alternative is resource-intensive.

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