US-bound Galaxy S10+ gets benchmarked with 6GB RAM, solid performance scores
The most logical explanation for the huge browsing speed gap is that this particular Samsung Galaxy S10+ prototype is far more advanced, running optimized Android 9.0 Pie software for an imminent commercial rollout.
Then again, while the SM-G975U manages to essentially match the purported single-core score of a pre-release Sony Xperia XZ4 version, the latter still reigns supreme in terms of (theoretical) multi-core power, with an edge of around 2500 points.
That may have something to do with the XZ4 packing 8 full gigs of memory, although two different Galaxy S10+ variants (with 6 and 8GB RAM) are obviously not to be ruled out.
By the way, the SM-G975U model number is expected to designate the unlocked US-specific Galaxy S10 Plus, following in the footsteps of a Galaxy S9+ that carries the SM-G965U model number stateside.