I have couple of WP sites on siteground.com.
Apparently I'm using a lots of resources because unoptimized database.
You will need to investigate problematic queries and fix the problem.
19 freelancers are bidding on average $173 for this job
I am a skilled wordpress developer, I have optimize lot of wordpress site, please tell your hosting plan and traffic and resource usage, thanks. let discuss more via private message, thanks.