Here's two of the flash objects, they're present in every test I run and take up about 77kb.
PHP Code:
URL: http://ds.serving-sys.com/BurstingRes//Site-501/Type-2/21ca2a22-3446-40ed-a00d-e0f68b03fe79.swf
Host: ds.serving-sys.com
IP: 23.0.160.83
Location: Akamai
Error/Status Code: 200
Client Port: 59942
Start Offset: 2.324 s
Time to First Byte: 36 ms
Content Download: 61 ms
Bytes In (downloaded): 39.2 KB
Bytes Out (uploaded): 0.5 KB
PHP Code:
URL: https://secure.img-cdn.mediaplex.com/0/12309/207334/159284_us_cs_li_fy15q4w01_oa_Workstations-Engineering_300x250_iip-.swf
Host: secure.img-cdn.mediaplex.com
IP: 23.203.54.26
Location: Akamai
Error/Status Code: 200
Client Port: 59950
Start Offset: 3.010 s
Time to First Byte: 46 ms
Content Download: 35 ms
Bytes In (downloaded): 38.3 KB
Bytes Out (uploaded): 0.5 KB