15.3 DYNAMIC_MODULE_LIMIT Apache Build Option

If you have no intention of using dynamically loaded modules (you probably don't if you're tuning your server for every last ounce of performance), you should add -DDYNAMIC_MODULE_LIMIT=0 when building the server. This will save RAM that's allocated only for supporting dynamically loaded modules.

    Part I: mod_perl Administration
    Part II: mod_perl Performance
    Part VI: Appendixes