Often overlooked for smaller merchants, this is an important role for an Ecom Manager in ensuring expectations are met where performance is concerned.
The first place to look is the software. If your extensions are vast you might fear that there are troublesome extensions hogging your processing power and slowing page load times.
If you're using MDOQ managed Magento hosting, these steps can be easily carried out on a development instance. With your MDOQ instance ready, click the 'Support' icon, then 'Web SSH' and after selecting your key click 'Connect'
php bin/magento dev:profiler:enable
If you're not using MDOQ, then you can carryout these steps on your development environment.