Ryan Hellyer

Prevents the scripts and styling from the Contact Form 7 plugin from loading on your site. Useful for situations in which you do not require the AJAX functionality of the original plugin and have included all the necessary styling in your themes CSS.

Deregister Contact Form 7

Prevents the scripts and styling from the Contact Form 7 plugin from loading on your site. Useful for situations in which you do not require the AJAX  …

nigro.simone

This small plugin (2 Kb) moves JavaScript to the footer and improve page load times. 
Note: this only works if your other plugins and theme add the JavaScripts correctly.
Configurations are not required! You just have to install it and after the plugin does it all, none further action it’s required.

Speed Up – JavaScript To Footer

Move all the possible JavaScript files from head to footer and improve page load times.

Deregister Contact Form 7 vs Speed Up – JavaScript To Footer