[jcranberry]

I have a friend who runs a hedge fund, not really insecure at all but uses templates vigorously. More stuff in compile time rather than runtime. In critical sections inheritance can be prohibitively expensive because of the use of lookup tables.

[monocasa]

Thrashing your I$ because you have too many template instantiations can be prohibitively expensive too, it's just harder to metric.

[mhh__]

Just how many nested templates are we talking about here? You can have that problem (obviously) with or without templates. Most sane template designs don't exist when the program is actually run (Debugging them when they don't work is another matter)

[makapuf]

if you're using templates for compile time computations it's maybe time for c++14 or even c++17 simpler constexpr functions (if possible and available, and if allowed to, ofc.)