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It looks like they have changed the complier for this firmware version, maybe changd the optimisation level too. That might explain some of the slowness.
Firmware 2.8.1, 3.19.5761, 4.5.9587:
GCC: (crosstool-NG linaro-1.13.1-4.8-2013.04-20130417 - Linaro GCC 2013.04) 4.8.1 20130401 (prerelease)
Firmware 4.6.9960:
GCC: (Linaro GCC 4.9-2017.01) 4.9.4
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