Of course one of the reasons — the design of default share buttons. Maybe it just didn’t match the design of you website.
Another reason is Google PageSpeed Insights. Please add the URL of this post (with default share buttons) and look at the result.
This is what I see:
How Can We Optimize That?
Some perfomance tips:
- Use custom share buttons.
- Load default share buttons via ajax.
- In WordPress use conditional tags, e.g
is_single()to load default button scripts just when we need them.