AMD frequently cascade GPU SKUs (same product, lower number) when they release new architectures. Your GPU was first introduced as the HD 87XXM in 2013 and is a 1st Gen GCN card (Southern Islands 28nm). It was respun as the R7 M260 in 2014, the R7 M360 in 2015, and both the R7 M460 and R7 M465 in 2016. To make matters more confusing, the same GPU design was used for the desktop 8XXX series (8570/8670), R5 240, R7 240 and 250, R5 330, R5 340, R7 340 and 350, R5 430 and 435, R7 430 and 435, and most recently, the 530.
I'm sure AMD have made small improvements each year that this design was rebranded (looks like at least memory and clockspeeds), but overall, it's still the same feature set and architecture as the Radeon 8XXX series in 2013. There's only so much that can be done to improve its performance.
