Slow loading and high CPU when posting/uploading images etc

On 2 of my sites that are hosted with WPMU DEV, whenever I create a post the post takes a long time to submit & the CPU hits 100%.

Also on the same 2 sites, when uploading images to media library with Smush enabled, it can take 5 – 8 minutes to upload just 5 images and also the CPU hits 100% too.

We narrowed the creating posts issue down to Smartcrawl plugin, de-activating it and creating posts then submits in about 1 second with CPU of around 25%, but as soon as smartcrawl is enabled, then posts can take upwards of 6 – 10 seconds and the CPU hits 100%.