Search Engine:
Google: ~ 92.6%
Bing: ~ 2.79%
Yandex: ~ 1.65%
Yahoo: ~ 1.1%
DuckDuckGo: ~ 0.52%
Baidu: ~ 0.44%
Other
*Source: StatCounter GlobalStats

Since Google is the predominantly used search engine, consider using Google's SEO tools such as PageSpeed Insights.