Users of Arduino IDE 2.x have reported a critical bug where the Arduino Language Server causes CPU usage to spike to 100% due to endless background indexing loops. This performance issue, which results in significant interface lag and high memory consumption, can be mitigated by disabling the real-time background diagnostic scanner through the Command Palette. For more details, visit Arduino Forum.
CPU utilization Very High – Page 3 – IDE 2.x – Arduino Forum
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