I have added a custom domain to my application and the latency
dramatically increased, it went up from 65ms to 190ms.
The custom domain is mapped to ghs.l.google.com and the appspot domain
seems to be mapped to appspot.l.google.com

Home (Germany) -> *.appspot.com
  1    <1 ms    <1 ms    <1 ms  gxxx.adsl.alicedsl.de [xxx]
  2    45 ms    47 ms    44 ms  lo1.br59.ber.de.hansenet.net
[213.191.64.183]
  3    55 ms    46 ms    69 ms  ae1-114.cr01.ber.de.hansenet.net
[62.109.111.253]
  4    64 ms    66 ms    63 ms  so-1-0-0-0.cr01.fra.de.hansenet.net
[213.191.66.21]
  5    62 ms    72 ms    73 ms  ae1-102.pr01.fra.de.hansenet.net
[62.109.109.240]
  6    68 ms    67 ms    63 ms  fra32-hansenet-2.fra.seabone.net
[89.221.34.25]
  7    64 ms    69 ms    66 ms  72.14.198.129
  8    63 ms    63 ms    63 ms  72.14.198.129
  9    77 ms    71 ms    71 ms  209.85.255.170
 10    65 ms    65 ms    68 ms  209.85.254.118
 11    65 ms    65 ms    77 ms  209.85.254.134
 12    65 ms    76 ms    72 ms  fx-in-f141.1e100.net [74.125.39.141]

Home (Germany) -> custom domain
  1    <1 ms    <1 ms    <1 ms  gxxx.adsl.alicedsl.de [xxx]
  2    49 ms    45 ms    54 ms  lo1.br59.ber.de.hansenet.net
[213.191.64.183]
  3    48 ms    51 ms    53 ms  ae1-114.cr01.ber.de.hansenet.net
[62.109.111.253]
  4    63 ms    69 ms    63 ms  so-6-1-0-0.cr01.fra.de.hansenet.net
[213.191.87.173]
  5    62 ms    89 ms    70 ms  ae1-102.pr01.fra.de.hansenet.net
[62.109.109.240]
  6    64 ms    65 ms    62 ms  fra32-hansenet-4.fra.seabone.net
[89.221.34.45]
  7    70 ms    69 ms    63 ms  google-2-decix.fra.seabone.net
[89.221.34.90]
  8    63 ms    66 ms    63 ms  google-2-decix.fra.seabone.net
[89.221.34.90]
  9    73 ms    89 ms    78 ms  209.85.255.170
 10    77 ms    79 ms   115 ms  72.14.233.104
 11   171 ms   156 ms   161 ms  216.239.43.90
 12   165 ms   171 ms   165 ms  209.85.248.75
 13   192 ms   185 ms   179 ms  209.85.243.25
 14   178 ms   183 ms   181 ms  64.233.174.117
 15     *      192 ms     *     72.14.236.193
 16   184 ms   192 ms   184 ms  vw-in-f121.1e100.net [74.125.113.121]


Dedicated Server (Germany) -> *.appspot.com
 1  xxx (xxx)  0.398 ms  0.356 ms  0.313 ms
 2  xe-0-1-0.cr-nashira.cgn4.hosteurope.de (80.237.129.13)  0.535 ms
0.580 ms  1.025 ms
 3  xe-0-0-0.cr-polaris.fra1.hosteurope.de (80.237.129.110)  3.199 ms
3.177 ms  3.130 ms
 4  de-cix20.net.google.com (80.81.193.108)  4.152 ms  5.538 ms  4.021
ms
 5  209.85.255.176 (209.85.255.176)  4.170 ms 209.85.255.178
(209.85.255.178)  4.693 ms 209.85.255.176 (209.85.255.176)  3.999 ms
 6  216.239.48.11 (216.239.48.11)  15.645 ms  15.336 ms 209.85.242.184
(209.85.242.184)  13.291 ms
 7  216.239.48.5 (216.239.48.5)  19.750 ms  19.656 ms  19.507 ms
 8  64.233.174.55 (64.233.174.55)  19.663 ms 64.233.174.53
(64.233.174.53)  19.642 ms 64.233.174.29 (64.233.174.29)  19.616 ms
 9  209.85.255.245 (209.85.255.245)  23.354 ms 209.85.255.249
(209.85.255.249)  27.015 ms  19.528 ms
10  bw-in-f141.1e100.net (74.125.43.141)  19.846 ms  20.209 ms  20.044
ms

Dedicated Server (Germany) -> custom domain
 1  xxx (xxx)  0.295 ms  0.226 ms  0.207 ms
 2  xe-0-1-0.cr-nashira.cgn4.hosteurope.de (80.237.129.13)  0.440 ms
0.374 ms  0.383 ms
 3  xe-0-0-0.cr-polaris.fra1.hosteurope.de (80.237.129.110)  2.940 ms
2.916 ms  2.917 ms
 4  de-cix10.net.google.com (80.81.192.108)  3.839 ms  8.227 ms  3.735
ms
 5  209.85.255.172 (209.85.255.172)  4.110 ms  4.308 ms  4.081 ms
 6  209.85.250.140 (209.85.250.140)  10.291 ms 209.85.248.182
(209.85.248.182)  11.398 ms  10.366 ms
 7  72.14.233.62 (72.14.233.62)  16.642 ms  16.379 ms  17.642 ms
 8  209.85.250.54 (209.85.250.54)  84.229 ms  94.260 ms  99.972 ms
 9  209.85.251.233 (209.85.251.233)  108.438 ms 216.239.46.14
(216.239.46.14)  109.262 ms 209.85.251.233 (209.85.251.233)  109.883
ms
10  72.14.233.116 (72.14.233.116)  161.417 ms  161.192 ms
216.239.43.80 (216.239.43.80)  158.093 ms
11  209.85.250.126 (209.85.250.126)  159.715 ms  157.082 ms  157.811
ms
12  216.239.48.165 (216.239.48.165)  164.236 ms  167.967 ms
64.233.174.131 (64.233.174.131)  163.313 ms
13  64.233.174.129 (64.233.174.129)  163.755 ms  164.108 ms
72.14.232.6 (72.14.232.6)  167.963 ms
14  72.14.232.70 (72.14.232.70)  163.064 ms  174.856 ms 72.14.232.6
(72.14.232.6)  162.999 ms
15  pw-in-f121.1e100.net (74.125.53.121)  163.334 ms  160.189 ms
163.112 ms


There is also an open issue from 2008 (!!!)
When can i expect this to be fixed?

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