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There are many reasons leading your website is slow. Please check this blog for more details:
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I have been checked your site http://www.candgholsters.com and found have some issue.1. Your home page slide use image to weight, you can you
1. Your home page slide use image to weight, you should upload small image and use option lazy load: single as this link http://prntscr.com/cqkklt
2. Your site to many plugins and maybe chat plugin make your site slow down.
3. Your home page gets Instagram feed, it can't cache on browser or server.
4. You can use EWWW Image Optimizer to optimize your image.
Please check it and let me know again.
To turn on this option please go to slider settings, on right sidebar choose performance and SEO optimization, you will see lazy load option.
Okay, you can try resolution 1920x1000, it fit full screen of PC device. And you should use JPG type for image, or try some compress site online for image as https://tinyjpg.com/.
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