Same for me. Mouse is Logitech MX master. Mouse speed slider have no effect on 
my mouse.
The only way I was able to increase mouse speed is using xinput utility as 
described in this link:
https://askubuntu.com/questions/794185/how-to-disable-mouse-acceleration-in-ubuntu-16-04

Command that worked for me: 
xinput --set-prop "pointer:MX Master" "libinput Accel Speed" 0.8

Output of xinput --list-props for my device:

Device 'MX Master':
        Device Enabled (140):   1
        Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Accel Speed (317):     0.800000
        libinput Accel Speed Default (318):     0.000000
        libinput Accel Profiles Available (319):        1, 1
        libinput Accel Profile Enabled (320):   1, 0
        libinput Accel Profile Enabled Default (321):   1, 0
        libinput Natural Scrolling Enabled (322):       0
        libinput Natural Scrolling Enabled Default (323):       0
        libinput Send Events Modes Available (262):     1, 0
        libinput Send Events Mode Enabled (263):        0, 0
        libinput Send Events Mode Enabled Default (264):        0, 0
        libinput Left Handed Enabled (324):     0
        libinput Left Handed Enabled Default (325):     0
        libinput Scroll Methods Available (326):        0, 0, 1
        libinput Scroll Method Enabled (327):   0, 0, 0
        libinput Scroll Method Enabled Default (328):   0, 0, 0
        libinput Button Scrolling Button (329): 2
        libinput Button Scrolling Button Default (330): 2
        libinput Middle Emulation Enabled (331):        0
        libinput Middle Emulation Enabled Default (332):        0
        Device Node (265):      "/dev/input/event17"
        Device Product ID (266):        0, 0
        libinput Drag Lock Buttons (333):       <no items>
        libinput Horizontal Scroll Enabled (334):       1

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https://bugs.launchpad.net/bugs/1682193

Title:
  Mouse acceleration significantly reduced after upgrade to 17.04

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