Web pages slow to load

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switters

Honorable
Jul 2, 2012
7
0
10,510
#1
About 5 days ago I noticed a significant slow down in loading web pages. In some cases, I see a blank white screen for up to a minute before the page loads. In others, the page never loads at all. And sometimes they do load very quickly as expected. This happens with my iMac that is connected to an Airport Extreme router via ethernet, as well as my Macbook Air connected via Wifi.

I have a high speed Comcast/Xfinity cable internet connection: Blast 250Mbps.

I tried connecting my iMac directly to the cable model (Arris Surfboard SB6183), and there is no problem. Download speed was 300Mbps and upload 30Mbps.

I then hooked up my Airport Extreme router again, and connected the iMac to the router via Ethernet. Download speed dropped to 100Mbps.

I then did a speed test with my Macbook Air which is connected via Wifi and the Airport Extreme router. Download speed dropped to 35 Mbps.

I went to this IP http://192.168.100.1/ to check status of my modem. Downstream power level of channels ranges from 0.0–0.8dBmV. Downstream SNR is 39.5. Upstream power level is between 47.8dBmV and 50.8dBmv.

Here are the traceroute results:

traceroute: Warning: www.comcast.net has multiple addresses; using 165.254.247.211
traceroute to a1526.dscg.akamai.net (165.254.247.211), 64 hops max, 72 byte packets
1 10.0.1.1 (10.0.1.1) 2.192 ms 0.988 ms 1.286 ms
2 96.120.88.121 (96.120.88.121) 9.040 ms 9.850 ms 10.577 ms
3 te-0-7-0-8-sur04.pinole.ca.sfba.comcast.net (68.86.143.165) 11.723 ms 11.777 ms 10.571 ms
4 be-324-rar01.pleasanton.ca.sfba.comcast.net (162.151.79.133) 13.216 ms 12.924 ms 13.155 ms
5 hu-0-1-0-0-ar01.hayward.ca.sfba.comcast.net (68.85.154.81) 14.496 ms 12.850 ms 32.718 ms
6 he-0-19-0-0-ar01.santaclara.ca.sfba.comcast.net (68.85.154.253) 12.933 ms 15.396 ms 14.290 ms
7 be-33651-cr01.sunnyvale.ca.ibone.comcast.net (68.86.90.93) 14.314 ms 14.315 ms 16.543 ms
8 be-10925-cr01.9greatoaks.ca.ibone.comcast.net (68.86.87.158) 16.202 ms 15.464 ms 16.819 ms
9 68.86.86.242 (68.86.86.242) 34.340 ms 14.933 ms 15.866 ms
10 ae-13.r02.snjsca04.us.bb.gin.ntt.net (129.250.66.33) 15.590 ms 33.000 ms 16.529 ms
11 ae-11.r23.snjsca04.us.bb.gin.ntt.net (129.250.6.118) 14.416 ms 15.798 ms *
12 ae-3.r21.sttlwa01.us.bb.gin.ntt.net (129.250.3.125) 103.730 ms 40.579 ms 34.077 ms
13 ae-29.r05.sttlwa01.us.bb.gin.ntt.net (129.250.2.89) 34.109 ms 33.969 ms 34.142 ms
14 165.254.247.211 (165.254.247.211) 35.155 ms 33.742 ms 34.115 ms
Click to expand...

Here is the ping:

PING a1526.dscg.akamai.net (184.25.56.196): 56 data bytes
64 bytes from 184.25.56.196: icmp_seq=0 ttl=56 time=15.054 ms
64 bytes from 184.25.56.196: icmp_seq=1 ttl=56 time=14.924 ms
64 bytes from 184.25.56.196: icmp_seq=2 ttl=56 time=41.168 ms
64 bytes from 184.25.56.196: icmp_seq=3 ttl=56 time=15.984 ms
64 bytes from 184.25.56.196: icmp_seq=4 ttl=56 time=15.968 ms
64 bytes from 184.25.56.196: icmp_seq=5 ttl=56 time=50.185 ms
64 bytes from 184.25.56.196: icmp_seq=6 ttl=56 time=94.391 ms
64 bytes from 184.25.56.196: icmp_seq=7 ttl=56 time=141.432 ms
64 bytes from 184.25.56.196: icmp_seq=8 ttl=56 time=172.458 ms
64 bytes from 184.25.56.196: icmp_seq=9 ttl=56 time=21.630 ms
64 bytes from 184.25.56.196: icmp_seq=10 ttl=56 time=16.954 ms
64 bytes from 184.25.56.196: icmp_seq=11 ttl=56 time=42.127 ms
64 bytes from 184.25.56.196: icmp_seq=12 ttl=56 time=16.006 ms
64 bytes from 184.25.56.196: icmp_seq=13 ttl=56 time=16.319 ms
64 bytes from 184.25.56.196: icmp_seq=14 ttl=56 time=15.741 ms
64 bytes from 184.25.56.196: icmp_seq=15 ttl=56 time=14.654 ms
64 bytes from 184.25.56.196: icmp_seq=16 ttl=56 time=14.822 ms
64 bytes from 184.25.56.196: icmp_seq=17 ttl=56 time=16.076 ms
64 bytes from 184.25.56.196: icmp_seq=18 ttl=56 time=37.277 ms
64 bytes from 184.25.56.196: icmp_seq=19 ttl=56 time=35.660 ms
64 bytes from 184.25.56.196: icmp_seq=20 ttl=56 time=80.904 ms
Click to expand...

How can I troubleshoot this?
 
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S

switters

Honorable
Jul 2, 2012
7
0
10,510


Yeah, and it does help for a short period of time. But then it gets worse again.

Someone in another forum said that the Motorola Surfboard modems and Airport routers don't play nice together, so I'm investigating that.
 
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S

switters

Honorable
Jul 2, 2012
7
0
10,510


This was the exact quote from the other forum:

There is a known compatibility issue with the Arris / Motorola SB61XX-series of modems with the AirPort base stations. Neither are bad by themselves, they just don't "play nice" together.
Click to expand...
 
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