Hi,
That’s not normal, try to disable all plugins except SwiftFramework.
Also instead Mamp you should try local by flywheel that if necessary you can enable a live link to your localhost if necessary so we can have a look.
https://local.getflywheel.com
It also can be memory related, try to increase the memory inside the wp-config.php
Change your WordPress memory to 128M or a maximum 256M.
Also check the official documentation from WordPress in the link below.
https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP
-Rui