Host Delivery Optimization Service is, as the name suggests, a service that optimizes the delivery of important updates to your system. It runs in the background on your system and consumes very few resources.
So if you find that this host delivery optimization service is unusually using your network bandwidth (more than 2 Mbps) for an extended period of time, there are some issues that need to be addressed manually.
What is causing the “Service Host Delivery Optimization” to load your hard drive or CPU high?
Your Windows Store may be automatically downloading updates in the background, which is causing the problem. The Windows Store is often ignored because we don’t use it daily.