Actually, there is a way to tell which plugins may be the problem.  The [P3 plugin][1]  (ironically, written by GoDaddy) can be used to generate a report of what each plugin is doing in terms of runtime.  Longer run times will usually correlate with more resources consumed and give you some initial guidance on which plugins to examine first. 


  [1]: https://wordpress.org/plugins/p3-profiler/