Nothing to see here :) Exponential time is sometimes confused with [quadratic time], however.

Perhaps we need a page somewhere that discusses performance in a more abstract
way.

For example, there is a hierarchy of performance metrics:

   * Constant time
   * Linear time
   * [Quadratic time]
   * Polynomial time
   * Exponential time
   * ?

Some [Tcl] operations are likely to fall into these categories in a predictable
way, and some not.  It might be interesting to categorize some of the [dict], [list], and
[array] operations to see how they behave.
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[Category Performance]