I turn on BitLocker in a tablet and laptop with Windows 10.
HDD: SEAGATE Barracuda with 1TB capacity and 7200rpm, the specific type is ST1000DM010, 64MB cache.
Processor: Intel Pentium CPU G4400, dual-core dual-threads, 3MB cache, clocked at 3.3GHz. The specification of CPU lists the technology that supports the AES New Instructions.
SSD: TOSHIBA Q200EX, with 240G storage capacity, SATA3 port.
Processor: Intel Core i5-2430M CPU frequency 2.40GHz, the biggest Turbo frequency is 3.0G, dual-core four-threaded, 3MB cache.
BitLocker causes 50% - 60% performance loss in tablet while no influence on the laptop.
To find out whether processor effects or not, turn on BitLocker on a tablet with Windows 7.
Here are details:
HDD: SEAGATE Barracuda ST1000DM003, 1TB capacity, and 7200rpm, 64Mb cache.
Processor: Intel Xeon E3-1203 v3, quad-core eight threads, 8MB cache, 3.3GHz clock speed and Intel Turbo Boost allows users to increase the clock rate to 3.70 GHz. The specification of CPU lists the technology that supports the AES New Instructions.
From the result, this still has 50% write rate decreases. Therefore, the Processor doesn't impact performance at all.
Then I do an in-depth study of how BitLocker effect on read-write performance. SSD with AES chip inside would be affected less by turning on BitLocker.