You can conduct a site audit to obtain a performance report on the technical speed of your website.
You can also run your website via Google's Pagespeed Insights tool to see where you stand and what may be improved.
Large HTML page size
Review your page's source code, and consider optimising its structure, and/or removing inline scripts and styles.
Redirect chains and loops
Avoid using more than 3 redirects in a chain. In case you encounter one, redirect each URL in the chain to the actual destination page.
Slow HTML page load speed despite optimisation
If your page load is slow even after cleaning up your HTML, considering moving to a better hosting service with more resources.
What other issues do you usually encounter? Chime in.