In my experience, most people don't know they have TLB problems because, effectively, it's always bad.
It's only when you start getting to the metal to see what your hardware is actually capable of that the TLB stands out as a glaring source of inefficiency.
Put another way: yeah, the TLB is making your app slow, but it's doing so always, so you don't notice. Instead, you mistakenly think your hardware is just slower than it really is.
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In my experience, most people don't know they have TLB problems because, effectively, it's always bad.
It's only when you start getting to the metal to see what your hardware is actually capable of that the TLB stands out as a glaring source of inefficiency.
Put another way: yeah, the TLB is making your app slow, but it's doing so always, so you don't notice. Instead, you mistakenly think your hardware is just slower than it really is.