W 10 M doesn ' t perform that well on the s 400 phones . What blew my mind I was recently using a crappy dual core cortex a 7 powered Android phone , and it is significantly faster than the 640 at certain tasks . To put it into perspective the game Lara Croft Relic Run took ~ 45 seconds to load on the crappy spec Android vs around 1 minute 15 seconds . My Lumia 532 was ~ 1 minute 3 seconds at loading the game on 8 . 1 . I don ' t know what happened between 10 and 8 . 1 , but the performance has taken a noticeable nosedive . I think where the Lumias have always been better than Android are the basic day to day tasks were usually ran smoother . The performance of keyboard for instance was always sublime on 8 . 1 . Little things like this really enhance the user experience . The browser performance , app , and games have always been poor on the lower tier windows phones , just like on most Android . The advantage with Android , you usually end up with a more powerful SoC for the money . So you end up with greater performance anyhow .