In our series of Magento Speed Optimization blog. In this blog, we will discuss about extension and effect on speed.
In magento, you can disable module output via admin configuration. But this does stops modules from getting executed.
If you want to totally remove a module from Magento execution. You need to delete or remove .XML for that module. This is placed in app/etc folder. Make sure if XML file is renamed that extension is not .XML as Magento will read all files with .XML extension.
Some of the community modules are not developed with block caching in mind or these modules load objects that are already loaded. So we recommend not to just install every module without making sure they are not going to effect a lot on resource consumption.
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