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You can set a manual IP address instead of having it on Auto config. Also, if SSL is not really necessary, then you can turn it off. You can also try v1.9 from Download Synergy 1.9-rc3 (Fixes the macOS WiFi lag bug) forums thread.

Can you try using v1.9? You can get it from Download Synergy 1.9-rc3 (Fixes the macOS WiFi lag bug) forums thread. It would be best to uninstall the current version first and reboot machines before installing v1.9. Let us know how it goes.

Please provide more details about your machines (OS, 32/64 bit, Synergy version installed, connected to the network via Ethernet or Wi-Fi, specify which one is the server).