This is another unfortunate example of synthetic benchmarks being not equal to real-world (gaming) performance, lol.
I can only suggest:
- replace the SSHD with a decent SSD ... costs money but you only really need it for system/boot/cache (and can keep the SSHD installed for everything else), so even a puny 60GB or 120GB should be plenty.
- partition some memory (maybe 16GB or so) into a ROG RAMDisk ... and copy/install your game folders onto it ... ROG RAMDisk may or may not work on your older ASUS mobo, but if it doesn't then other RAM disk software is inexpensive ... alternately, you can try ROG RAMCache.
- install Intel® Optane™ ... I think it's a ripoff, to be honest, because for the same price you can just get a proper SSD, but since you currently lack a proper SSD you could benefit from Optane caching ... and I admit I'm uncertain whether it's compatible with pre-Skylake platforms, sorry.
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[/Korth]