Actel Silicon Explorer II Quick Start Manual page 22

Silicon Explorer II Quick Start
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A: The Analyze module bursts data back in blocks at high speeds,
with built-in retry for a bad block (it uses both checksum and byte
count). Some third-party serial programs block all interrupts,
forcing the analyzer into a retry loop.
Some laptops power down the UART and drop a few characters.
Try disabling "Power Saving" in the CMOS setup menu.
Q5: When the Explore window is open, my other Windows programs
run slowly. Why?
A: If the Explore window is open but not connected or powered up,
then the system is constantly timing out looking for a response.
Either close the SE II window or change the COM port to DEMO.