There are different types of user-perceived delays. One is visual delay or when nothing shows up because it is obviously loading slowly. Visual delay is dominated by network latency and large resource payloads but large script files also contribute to the delay.
The two Google scripts that have the most impact are typically found in website code. Google Double Click Ads consume a total of 466, 442 seconds of execution time while Google Tag Manager devours 421,590 seconds during the twice a month data gathering periods. Facebook code accounts for 145, 169 seconds.
In the worst average delay, the winner is Word Ads which is a WordPress ad system that consumes 2543 ms every time that it loads. Web users who have recognized that third party scripts are the reasons for their troubles have installed content or ad blocking extensions in their browsers. They also block third party requests on a network level.
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