http vs www

I noticed my website loads Fast when I just enter the URL without www

If I use the www it takes about 3 Seconds longer to Load.

EXAMPLE
Fast Load Time if I enter URL as below
https://websitehere.com or websitehere.com

Slow Load Time if enter URL as below
https://www.websitehere.com

Using Browsers now you are not required to use the www but most customers still use the www.

ANY TIPS on getting the www to LOAD Same Speed