I think, you have to read it like this:

He explained that IRQ suspension enhances network performance ... by reducing unnecessary CPU interruptions during high-traffic periods. It also maintains low latency during low-traffic conditions.

He explained that IRQ suspension enhances network performance, while maintaining low latency during low-traffic conditions. It accomplishes this by reducing unnecessary CPU interruptions during high-traffic periods.

Maybe that makes more sense? The original was definitely a run-on sentence, and needed some punctuation.