Try plugging in your sound interface directly into usb port bypassing usb hub. If that changes latency USB is your bottleneck.
Second thing to check is ASIO. Check that you're using Focusrite latest ASIO driver and it's selected in Reaper audio device preferences, also set buffer size to 256 samples. If that didn't help try to install ASIO4ALL and use it instead, which may improve latency time.
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