Several tools can help you measure and analyze the loading time of your emails:
Litmus: Allows you to test emails in various email clients and devices to check loading times and rendering issues. Email on Acid: Another tool for testing how emails render in different environments, including loading times. Google PageSpeed Insights: While primarily for web pages, this can give insights into how optimized your images and content are. Pingdom: Useful for testing the load time of web elements that might be included in your emails.