How many variables has your Drupal install?

When I was analysing performance of a one Drupal powered website, I need to count number of Drupal variables and their approximate size in memory. I used my beloved module Devel. Devel itself contains tool called "Variable editor" (it is a big form, where you can adjust Drupal variables directly). Unfortunaltely man can't simply get the count or size of variables and because there is no pagination and number of variables was quite big I was getting PHP memory limit error each time when I tried to access this page.

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