Slow website, ralated with LINKED PRODUCT ?

This several days, my website is becoming slow. It even can't be connected sometimes.

I record what I changed in the past. I think the only thing is
'I added more products in the site, and linked the same item in multiple categories.'

Does this LINKING action cause the site slow??

The hosting company said:
My database should be optimized, but I didn't change anything with that recently. And the site is fast before. So I'm sure database won't be the issue for this case.

Thank you for helping out.

williamL:

This several days, my website is becoming slow. It even can't be connected sometimes.

The hosting company said:
My database should be optimized, but I didn't change anything with that recently. And the site is fast before. So I'm sure database won't be the issue for this case.

Thank you for helping out.

And you are hosted with ???
also a link to your site would be helpful

Under the "version" right side, what is the server load. There are 3 values. Checking that periodically, especially when it is going slow might also help.

Although, the host should have realized that it was high when you sent in a ticket about it, and it would be odd that it happened right after you made the change, but worth a look.

Thank you for your reply!!!

The host is globat, After I called them and sent 2nd ticket, the website speed becomes much better today.
So I'm sure it's about the server, nothing about the website database