Hardware = ASUS RT-N16 Firmware = Tomato Firmware v1.28.9054 MIPSR2-beta K26 USB vpn3.6, Linux kernel 18.104.22.168 and Broadcom Wireless Driver 22.214.171.124 updates, Issue: USB storage device plugged into ASUS router has delay when saving from wireless device (my main machine). For example, Excel spreadsheet opened, changes are made, press "Ctrl+S" to save. I would notice a pop-up window showing the progress of saving the changes. Immediately after pressing "Ctrl+S", if I press additional keys on the keyboard to queue them up they are blocked by the pop-up window and are not entered into the Excel spreadsheet. Background Moved the laptop from close to router to further from router (i.e. wireless signal quality from excellent to OK) still yield similar behaviour. Does not appear to be wireless strength related. Plugged external hard drive and USB onto a Windows 7 computer (Quad-Core, 8 GB RAM, connected by Gigabit ethernet). Shared both storage devices and conducted similar test (strong and OK wireless signal) with the exact same spreadsheet (i.e. press "Ctrl+S" and then queue keystrokes). Both storage devices have no lag (i.e. no pop-up window) and therefore the queued up keystrokes are sent to the Excel spreadsheet after it was saved. Plugged external hard drive and USB onto a Windows XP computer (Single Core 1.2 Ghz, 1 GB RAM, connected by 100 mpbs ethernet). Similar behaviour to the Windows 7 computer. Theories ASUS router has only 480 Mhz processor and 128 MB RAM so it's weak and slow compared to a desktop, even a very old one. System overview shows CPU loads usually at 0/0/0 so I don't think it's heavily loaded. RAM usage has 10-15% free (~10-20MB). Based on the low system loads on the router, I don't believe that the router is struggling to keep up or respond to a simple request. Difference between Linus OS (ASUS router) and Windows XP/7 OS for the desktops in terms of SAMBA or file sharing that results in slower response time (i.e. pop-up saving window). Can someone with better system knowledge shed some light as to why I get the stupid pop-up window showing the progress of me saving an Excel file?