Avoid enormous network payloads

Running a WP site, so asking here.

Google speed test shows
“Avoid enormous network payloads – Total size was 8,265 KB”

  • (static.doubleclick.net) – 514.2 KB
  • (static.doubleclick.net) – 514.2 KB

And several more of doublick that seems pretty huge to me.

So Adwords is causing this? Or something in WP configuration?