![]() It not only affects Synergy users, but gamers too. The bad news is that it's an issue that Apple hasn't been fixed yet. The good news is that it's probably not your wifi access point causing the issue, and it's most likely the problem described above (an issue with your wifi adapter). Obviously, not using these apps is not really an option, but at least knowing what can cause a ping spike may help with frustration. Many macOS apps cause the WiFi adapter to be queried, so either opening or just generally using apps like Chrome and Safari almost always trigger a ping spike. Response times in the hundreds of milliseconds mean that the cursor will feel as if it's lagging. This is the delay caused by the macOS issue and it impacts the performance of Synergy. Notice that the ping times are now in the 100s of milliseconds, for example, 489.221 ms. Click on the Ping tab and you should be presented with the following: To perform a ping open the Network Utility from Applications > Utilities. As part of the ping process, the time taken for the remote computer to respond is measured. Ping is a utility for checking communication between computers is operational essentially an "are you there?" message between computers. "While it’s on that temporary channel, the STA can’t be on the channel it’s using to communicating with the AP, and thus you see spikes in latency." - Quinn “The Eskimo!” (Developer Technical Support, Core OS/Hardware at Apple) How can I see a ping spike on my macOS? We have opened a dialog with Apple Developer Relations about this issue, which has thankfully been fielded by Quinn “The Eskimo!” (Developer Technical Support, Core OS/Hardware at Apple) and we're working with them to try to solve the problem. One of the best ways to see the slowdown is to use the Network Utility app (included with macOS) and look for a "ping spike", a condition where communication between computers slows down. This doesn't just affect Synergy all applications requiring network access are impacted, including games and Apple's own utilities. As far as we know, Apple has not announced plans to fix this issue. The mouse lag problem is caused by a long-standing underlying macOS issue which causes the wifi hardware to temporarily slow down under certain conditions, such as having the wifi menu bar open. Some tools such as WiFriedX have been created to disable AWDL and AirDrop, which some people suspect causes this issue. You can tell if a machine is the server computer if it has a white dot on it on the Synergy config app. Generally, mouse lag happens on macOS when the macOS is the client computer and not the server computer. This wifi lag could affect your Synergy experience, causing mouse lag where the mouse cursor movement appears delayed or choppy. This is also known as a "ping spike" (named after the ‘ping’ tool). On macOS, the wifi adapter can sometimes lag randomly. ![]() Other than slow wifi, the only possible cause could be a problem with the CPU or memory problems that can cause the mouse cursor to lag. There are currently no known issues in Synergy for the Windows and Linux operating systems that could cause mouse lag. If your computers don't have ethernet ports, you may need to purchase a USB ethernet adapter. If your ethernet network is in another room, or you don't have one, then you could set up an ethernet network. The best solution is to use an ethernet cable. You can check if this is the issue by doing a ping test. The most common cause for a mouse cursor to lag is usually a bad WiFi connection.
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