Loading Speed Optimize AdSense Ads

blog loading slowly because many AdSense ads on a page? Optimize Speed is the following ways.
How many AdSense ad units buddy pairs? Two units? Three untit? Or three AdSense ad units and two units of ad links? Or even maybe with advertisements in the search box Google Custom Search?

AdSense ad units are pretty much turned out to slow down the speed of loading the blog, yes.

So this started when I think about it. I look again, observing the code of AdSense ad units and link AdSense ad units. There are inefficient there - because I just realized: D.

Installation efficiency AdSense Ad Unit Code - Causing Slow Loading Blog
We know, after making an AdSense ad units, and ready to take on the code, there is a script above markers <ins class as follows:

<script async='async' src='http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js'></script>

   It is an external script that your blog should call for the calculation of the AdSense ads: impressions, clicks, etc.
Each external script contribute to the quality of the speed: fast loading least blog page. One call an external script affect the speed of loading - in milliseconds. For example, previously, there are four AdSense ad code on my blog complete with a script on each code. In this case, four external script clearly reduces the loading speed of my blog.
Just imagine, for example, if the external script takes 0.25ms (zero point two five milli seconds), then four external script takes load 1s (one second). But, this is just a pilot, not a case of AdSense script.
In connection with the AdSense ad units script, I observed the script in each code AdSense ad units, and gratitude, I am aware of. Name of the source (src) of the server on each ad unit code is the same: http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js. Then surely, the same contents.