Want to switch my elementor builder interface in simple editor like old Html one on my website tellthebell* as my site load's slowly due to this builder. want to know if my content will be loss or just the design will change?
Or suggest something that might help my loading time of site.
Yes agreed with the @cengiz sevimli Not only design will be lost also the content can be deleted. However if you have added any posts it will be saved at backend and you can add it up again from there in the new design.
well, a simple and easiest trick to do is save your content (Manually save in word doc) by pressing ctrl+A then switch to the old mode of HTML, if you lose your design/ interface..try editing or adding content that you already saved...Also, you can change your theme and again use the same content, etc.. it works very well you just need to be little tricky :P
Frist, you need to perform speed optimization for your website. It will help to load your website as soon as possible. You can use Autoptimize and WP Rocket Plugin to boost the speed of your website. Second, if you will switch your website from elementor to another builder you will lose complete design. After that, you need to redesign your website.
For check the speed of your website use : https://gtmetrix.com
If you change your builder, you may end up losing your designs. However you can try backing up your builder's raw code by pressing "Use Default Editor" like: 
