Assuming that there are no wifi connectivity issues, if you start to experience very long response times to requests from BridgePal scoring units it may be that something is running in the background on your PC and consuming all the system resources. If you start the Windows Task Manager you may see that either disk or CPU utilisation is very high, even 100%.
A likely culprit is anti-virus software, since this tends to decide to start a background scan when it thinks the system is idle, e.g. there is no mouse or keyboard input occurring. Even if you have not explicitly installed an anti-virus package you may have Microsoft's Windows Defender running if you are using Windows 8 or later, since it is on by default.
I strongly suggest disabling Windows Defender, or any other anti-virus package, for the duration of the bridge session. It is possible to prevent Windows Defender running by disabling the service (through Control Panel/Administrative Tools/Computer Management/Services and Applications/Services). The service is called “Windows Defender Service”. Note: On Windows 10 at least, the option to stop or disable the service is greyed out. If this is the case on your system try the solution at
http://www.windowscentral.com/how-permanently-disable-windows-defender-windows-10 (use the second option - "How to disable Windows Defender using the Registry", or try the third option for a temporary solution - "Bonus: How to disable Windows Defender using the Settings app").
UPDATE: For Windows 10, to disable Windows Defender, download the attachment "Disable_Windows_Defender_Real-Time_Protection.reg" to the desktop and double click on the file. Answer "Yes" to the warning messages. To re-enable Windows Defender download the attachment "Enable_Windows_Defender_Real-Time_Protection.reg" and follow the same instructions.