Both gtag.js tracking snippet and Google tag manager on?

Question

I noticed that both the gtag.js tracking snippet and Google tag manager (with GA tracking tag enabled) were placed at the same time.

Could this cause any tracking issues?

Answer 1

If you are using two Analytics codes in the same site (one directly in the code and another one trough Tag Manager) the consequences are:

• Higher load time (more javascript and external calls to execute)
• If they have the same UA, you will lose real information about bounce rate, time on site or page views (you are executing two hits in every interaction).