When I open a docx file over the network, it take about 5 seconds to open instead of opening instantly. It do the same for xlsx and jpg files. If I open the docx files with wordpad (right click on the file, open with, wordpad), it open instantly. The same for the jpg, it open by default with photo gallery but if I right click on it and open it with Photo viewer, it open instantly. I did try to open Word first and to browse for the file on the network with the same 5 seconds delay result. The network and computers are robust, latest generation i5 cpu with 8/16 gb of ram on computers with good cisco router. The network have been reseted (netsh winsock reset - netsh int ip reset all - netsh advfirewall reset - ipconfig /flushdns - nbtstat -R - nbstat -RR) with no better results. The routeur also have been restarted (not reseted however). I wonder what could cause this ?