server close to a limit message

hi there, i just tried to scan my website several times, however i do always being informed ‘
Your server resource usage is too close to your limit. Please try again in 15 minutes.
my question is what server? i just purchased after strongly recommendations from my host a dedicated server package for the domain for 160usd + this and + that etc… and in fact things haven’t became any better,in contrary my website is said to be even more slower then before… and now you guys telling me my server is on a limit? please advise… looks like a serious misconfiguration on domain please advise thank you