Another thing:
JSF doesn't (in base components) let you to define a variable on a page.
So people quite often would write something like
#{hashMapBean[key].prop}
in many places on the page, which in fact leads to looking up hashMap many times + using reflection to access property.
JSF also has several (6) stages of processing the question and it operates on
a tree of JSF components on these stages which also slowing things down.
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