Why my website slows down sometimes?

I have website having a PayPal commission calculator but sometimes my website becomes slow. i am new to all this website stuff. i think it has something to do with my SSL settings. can anyone help me out.
check out my website here:

First of all, your website isn’t here. My suggestion is check out at your cache settings. SSL settings seldom influence the visit speed, unless your cert is EXTREMELY LARGE, but it won’t happen if you are using the auto-generated cert.

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