Same issue here on Windows 7. Console output is attached. Note how each of 
these connection attemps to localhost takes 3 secs:

[D 14:39:15.003 NotebookApp] Connecting to: tcp://127.0.0.1:53196
[D 14:39:18.008 NotebookApp] Connecting to: tcp://127.0.0.1:53197
[D 14:39:21.010 NotebookApp] Connecting to: tcp://127.0.0.1:53198

Might this in fact be a networking issue?

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[D 14:38:41.916 NotebookApp] Searching ['C:\\WinPython-64bit-3.4.4.4Qt5\\noteboo
ks', 'C:\\WinPython-64bit-3.4.4.4Qt5\\settings\\.jupyter', 'C:\\WinPython-64bit-
3.4.4.4Qt5\\python-3.4.4.amd64\\etc\\jupyter', 'C:\\ProgramData\\jupyter'] for c
onfig files
[D 14:38:41.917 NotebookApp] Looking for jupyter_config in C:\ProgramData\jupyte
r
[D 14:38:41.917 NotebookApp] Looking for jupyter_config in C:\WinPython-64bit-3.
4.4.4Qt5\python-3.4.4.amd64\etc\jupyter
[D 14:38:41.917 NotebookApp] Looking for jupyter_config in C:\WinPython-64bit-3.
4.4.4Qt5\settings\.jupyter
[D 14:38:41.918 NotebookApp] Looking for jupyter_config in C:\WinPython-64bit-3.
4.4.4Qt5\notebooks
[D 14:38:41.918 NotebookApp] Looking for jupyter_notebook_config in C:\ProgramDa
ta\jupyter
[D 14:38:41.919 NotebookApp] Looking for jupyter_notebook_config in C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\etc\jupyter
[D 14:38:41.919 NotebookApp] Looking for jupyter_notebook_config in C:\WinPython
-64bit-3.4.4.4Qt5\settings\.jupyter
[D 14:38:41.920 NotebookApp] Loaded config file: C:\WinPython-64bit-3.4.4.4Qt5\s
ettings\.jupyter\jupyter_notebook_config.py
[D 14:38:41.920 NotebookApp] Looking for jupyter_notebook_config in C:\WinPython
-64bit-3.4.4.4Qt5\notebooks
[D 14:38:45.760 NotebookApp] Terminals not available (error was No module named
'terminado')
[I 14:38:45.930 NotebookApp] Serving notebooks from local directory: C:\WinPytho
n-64bit-3.4.4.4Qt5\notebooks
[I 14:38:45.931 NotebookApp] 0 active kernels
[I 14:38:45.932 NotebookApp] The Jupyter Notebook is running at: http://localhos
t:8888/
[I 14:38:45.933 NotebookApp] Use Control-C to stop this server and shut down all
 kernels (twice to skip confirmation).
[D 14:38:46.266 NotebookApp] Using contents: services/contents
[D 14:38:46.295 NotebookApp] 200 GET /tree (127.0.0.1) 29.01ms
[D 14:38:46.310 NotebookApp] 200 GET /static/components/jquery-ui/themes/smoothn
ess/jquery-ui.min.css?v=9b2c8d3489227115310662a343fce11c (127.0.0.1) 1.00ms
[D 14:38:46.312 NotebookApp] 200 GET /static/components/jquery-typeahead/dist/jq
uery.typeahead.min.css?v=7afb461de36accb1aa133a1710f5bc56 (127.0.0.1) 2.00ms
[D 14:38:46.315 NotebookApp] 200 GET /static/style/style.min.css?v=f6c09475baf6b
eabd41f8fe518601204 (127.0.0.1) 2.00ms
[D 14:38:46.316 NotebookApp] 200 GET /static/components/es6-promise/promise.min.
js?v=f004a16cb856e0ff11781d01ec5ca8fe (127.0.0.1) 1.00ms
[D 14:38:46.318 NotebookApp] 200 GET /static/components/requirejs/require.js?v=6
da8be361b9ee26c5e721e76c6d4afce (127.0.0.1) 1.00ms
[D 14:38:46.325 NotebookApp] 200 GET /custom/custom.css (127.0.0.1) 1.00ms
[D 14:38:46.327 NotebookApp] 200 GET /static/base/images/logo.png?v=7c4597ba713d
804995e8f8dad448a397 (127.0.0.1) 1.00ms
[D 14:38:46.339 NotebookApp] 200 GET /static/tree/js/main.min.js?v=16dbff8019505
bcf8e3dce7c79cf2e42 (127.0.0.1) 20.01ms
[D 14:38:46.433 NotebookApp] 200 GET /static/services/contents.js?v=201609221438
41 (127.0.0.1) 1.00ms
[D 14:38:46.453 NotebookApp] 200 GET /api/config/tree?_=1474547926369 (127.0.0.1
) 3.00ms
[D 14:38:46.455 NotebookApp] 200 GET /api/config/common?_=1474547926370 (127.0.0
.1) 2.00ms
[D 14:38:46.462 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:38:46.462 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:38:46.464 NotebookApp] 200 GET /api/kernelspecs (127.0.0.1) 6.00ms
[D 14:38:46.466 NotebookApp] 200 GET /static/components/font-awesome/fonts/fonta
wesome-webfont.woff?v=4.2.0 (127.0.0.1) 2.00ms
[D 14:38:46.467 NotebookApp] 200 GET /api/sessions?_=1474547926371 (127.0.0.1) 1
.00ms
[D 14:38:46.470 NotebookApp] 200 GET /custom/custom.js?v=20160922143841 (127.0.0
.1) 2.00ms
[D 14:38:46.483 NotebookApp] 200 GET /api/contents?type=directory&_=147454792637
2 (127.0.0.1) 6.00ms
[D 14:38:46.488 NotebookApp] 200 GET /static/base/images/favicon.ico?v=30780f272
ab4aac64aa073a841546240 (127.0.0.1) 1.00ms
[I 14:38:49.407 NotebookApp] Creating new notebook in
[D 14:38:49.409 NotebookApp] Saving C:\WinPython-64bit-3.4.4.4Qt5\notebooks\Unti
tled5.ipynb
[D 14:38:49.439 NotebookApp] 201 POST /api/contents (127.0.0.1) 32.01ms
[D 14:38:49.443 NotebookApp] Using contents: services/contents
[D 14:38:49.469 NotebookApp] 200 GET /notebooks/Untitled5.ipynb?kernel_name=pyth
on3 (127.0.0.1) 27.01ms
[D 14:38:49.479 NotebookApp] 200 GET /static/components/MathJax/MathJax.js?confi
g=TeX-AMS_HTML-full,Safe&delayStartupUntil=configured (127.0.0.1) 1.00ms
[D 14:38:49.481 NotebookApp] 200 GET /static/components/bootstrap-tour/build/css
/bootstrap-tour.min.css?v=d0b3c2fce6056a2ddd5a4513762a94c4 (127.0.0.1) 1.00ms
[D 14:38:49.482 NotebookApp] 200 GET /static/notebook/css/override.css?v=e6f1801
3b8771987812e992b38ec3318 (127.0.0.1) 1.00ms
[D 14:38:49.484 NotebookApp] 200 GET /static/components/codemirror/lib/codemirro
r.css?v=2336fb49f85e9fa887ada9af35223dce (127.0.0.1) 1.00ms
[D 14:38:49.485 NotebookApp] 304 GET /custom/custom.css (127.0.0.1) 1.00ms
[D 14:38:49.487 NotebookApp] 200 GET /static/components/text-encoding/lib/encodi
ng.js?v=d5bb0fc9ffeff7d98a69bb83daa51052 (127.0.0.1) 1.00ms
[D 14:38:49.517 NotebookApp] 200 GET /static/notebook/js/main.min.js?v=f8115aaf7
a88fe8ef22f54c4da3b8915 (127.0.0.1) 29.01ms
[D 14:38:49.529 NotebookApp] 200 GET /static/components/MathJax/config/TeX-AMS_H
TML-full.js?rev=2.6.0 (127.0.0.1) 3.00ms
[D 14:38:49.661 NotebookApp] 200 GET /static/components/MathJax/config/Safe.js?r
ev=2.6.0 (127.0.0.1) 2.00ms
[D 14:38:49.722 NotebookApp] 200 GET /api/config/notebook?_=1474547929585 (127.0
.0.1) 5.00ms
[D 14:38:49.725 NotebookApp] 200 GET /api/config/common?_=1474547929586 (127.0.0
.1) 1.00ms
[D 14:38:49.774 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:38:49.774 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:38:49.775 NotebookApp] 304 GET /api/kernelspecs (127.0.0.1) 2.00ms
[D 14:38:49.792 NotebookApp] 200 GET /api/contents/Untitled5.ipynb?type=notebook
&_=1474547929587 (127.0.0.1) 7.00ms
[D 14:38:49.794 NotebookApp] 304 GET /custom/custom.js?v=20160922143841 (127.0.0
.1) 1.00ms
[D 14:38:49.796 NotebookApp] 200 GET /static/components/MathJax/jax/output/HTML-
CSS/fonts/STIX-Web/fontdata.js?rev=2.6.0 (127.0.0.1) 2.00ms
[D 14:38:49.803 NotebookApp] 200 GET /static/components/MathJax/extensions/Safe.
js?rev=2.6.0 (127.0.0.1) 1.00ms
[D 14:38:49.805 NotebookApp] 200 GET /nbextensions/jupyter-leaflet/extension.js?
v=20160922143841 (127.0.0.1) 1.00ms
[D 14:38:49.811 NotebookApp] 200 GET /nbextensions/bqplot/extension.js?v=2016092
2143841 (127.0.0.1) 1.00ms
[D 14:38:49.816 NotebookApp] 200 GET /nbextensions/jupyter-vega/index.js?v=20160
922143841 (127.0.0.1) 5.00ms
[D 14:38:49.856 NotebookApp] 200 GET /api/contents/Untitled5.ipynb/checkpoints?_
=1474547929588 (127.0.0.1) 1.00ms
[D 14:38:49.919 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:38:49.920 NotebookApp] Starting kernel: ['C:\\WinPython-64bit-3.4.4.4Qt5\\
python-3.4.4.amd64\\python.exe', '-m', 'ipykernel', '-f', 'C:\\WinPython-64bit-3
.4.4.4Qt5\\scripts\\..\\settings\\runtime\\kernel-4efa187e-24ac-41a4-b6c8-7c1cec
630bf8.json']
[D 14:38:49.924 NotebookApp] Connecting to: tcp://127.0.0.1:53199
[I 14:39:01.955 NotebookApp] Kernel started: 4efa187e-24ac-41a4-b6c8-7c1cec630bf
8
[D 14:39:01.955 NotebookApp] Kernel args: {'kernel_name': 'python3', 'cwd': 'C:\
\WinPython-64bit-3.4.4.4Qt5\\notebooks'}
[D 14:39:01.957 NotebookApp] 201 POST /api/sessions (127.0.0.1) 12093.83ms
[D 14:39:01.958 NotebookApp] Native kernel (python3) available from C:\WinPython
-64bit-3.4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:39:01.959 NotebookApp] Serving kernel resource from: C:\WinPython-64bit-3.
4.4.4Qt5\python-3.4.4.amd64\lib\site-packages\ipykernel\resources
[D 14:39:01.960 NotebookApp] 200 GET /kernelspecs/python3/logo-64x64.png (127.0.
0.1) 2.00ms
[D 14:39:01.963 NotebookApp] 200 GET /nbextensions/jupyter-js-widgets/extension.
js?v=20160922143841 (127.0.0.1) 12157.86ms
[D 14:39:01.983 NotebookApp] Initializing websocket connection /api/kernels/4efa
187e-24ac-41a4-b6c8-7c1cec630bf8/channels
[D 14:39:01.988 NotebookApp] Requesting kernel info from 4efa187e-24ac-41a4-b6c8
-7c1cec630bf8
[D 14:39:01.988 NotebookApp] Connecting to: tcp://127.0.0.1:53196
[W 14:39:15.002 NotebookApp] Timeout waiting for kernel_info reply from 4efa187e
-24ac-41a4-b6c8-7c1cec630bf8
[D 14:39:15.003 NotebookApp] Opening websocket /api/kernels/4efa187e-24ac-41a4-b
6c8-7c1cec630bf8/channels
[D 14:39:15.003 NotebookApp] Connecting to: tcp://127.0.0.1:53196
[D 14:39:18.008 NotebookApp] Connecting to: tcp://127.0.0.1:53197
[D 14:39:21.010 NotebookApp] Connecting to: tcp://127.0.0.1:53198
[D 14:39:33.048 NotebookApp] Received kernel info: {'language_info': {'pygments_
lexer': 'ipython3', 'version': '3.4.4', 'nbconvert_exporter': 'python', 'codemir
ror_mode': {'version': 3, 'name': 'ipython'}, 'file_extension': '.py', 'mimetype
': 'text/x-python', 'name': 'python'}, 'banner': 'Python 3.4.4 (v3.4.4:737efcadf
5a6, Dec 20 2015, 20:20:57) [MSC v.1600 64 bit (AMD64)]\nType "copyright", "cred
its" or "license" for more information.\n\nIPython 5.1.0 -- An enhanced Interact
ive Python.\n?         -> Introduction and overview of IPython\'s features.\n%qu
ickref -> Quick reference.\nhelp      -> Python\'s own help system.\nobject?   -
> Details about \'object\', use \'object??\' for extra details.\n', 'help_links'
: [{'url': 'http://docs.python.org/3.4', 'text': 'Python'}, {'url': 'http://ipyt
hon.org/documentation.html', 'text': 'IPython'}, {'url': 'http://docs.scipy.org/
doc/numpy/reference/', 'text': 'NumPy'}, {'url': 'http://docs.scipy.org/doc/scip
y/reference/', 'text': 'SciPy'}, {'url': 'http://matplotlib.org/contents.html',
'text': 'Matplotlib'}, {'url': 'http://docs.sympy.org/latest/index.html', 'text'
: 'SymPy'}, {'url': 'http://pandas.pydata.org/pandas-docs/stable/', 'text': 'pan
das'}], 'status': 'ok', 'protocol_version': '5.0', 'implementation': 'ipython',
'implementation_version': '5.1.0'}
[D 14:40:49.911 NotebookApp] 200 GET /api/contents/Untitled5.ipynb?content=0&_=1
474547929589 (127.0.0.1) 2.00ms
[I 14:40:49.915 NotebookApp] Saving file at /Untitled5.ipynb
[D 14:40:49.915 NotebookApp] Saving C:\WinPython-64bit-3.4.4.4Qt5\notebooks\Unti
tled5.ipynb
[D 14:40:49.929 NotebookApp] 200 PUT /api/contents/Untitled5.ipynb (127.0.0.1) 1
5.00ms

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