There are many third-party Magento modules out there with bad code, using deprecated methods, or having compatibility issues with the latest stable version of Magento. The best way to identify heavy requests is to use a profiler. That helps you identify how many MySQL queries you have on a page and how many are identical. Knowing that, you can compact those queries into one, and thus speed up Magento.

One of the main things junior developers are doing wrong in Magento is to load models inside loops. Try to avoid that as much as you can. Load the whole collection with everything you need and then loop through it. Always keep in mind the time and space complexity and build your algorithm in an optimized way.
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