Shifting Issues

Just been out for a first ride after getting my bike back from the LBS after its 6 week service after purchase. Slight issue with rear deraillieur shifting.
Shifting from the big cog on the rear to the little cog on the rear, while in middle chainring (from gears 8 to 16) is fine, no worries, shifting is pretty much instantaneous. However, shifting from little cog to big cog (16 up to 8) one cog at a time takes forever to shift, a good 20-30 pedal rotations. If I change 2 or 3 gears at a time then it will jump 1 or 2 cogs but slip the last change unless I change back 1 gear. So its quicker to change up a gear by making 2 clicks on the shifter then back 1 click!!
Can anyone advise me which way to turn the adjuster on the rear deraillieur to ensure I get a quicker and more prominent up-change on a single click?
Has this made any sense?!?
Shifting from the big cog on the rear to the little cog on the rear, while in middle chainring (from gears 8 to 16) is fine, no worries, shifting is pretty much instantaneous. However, shifting from little cog to big cog (16 up to 8) one cog at a time takes forever to shift, a good 20-30 pedal rotations. If I change 2 or 3 gears at a time then it will jump 1 or 2 cogs but slip the last change unless I change back 1 gear. So its quicker to change up a gear by making 2 clicks on the shifter then back 1 click!!
Can anyone advise me which way to turn the adjuster on the rear deraillieur to ensure I get a quicker and more prominent up-change on a single click?
Has this made any sense?!?
Specialized Rockhopper '07
Trek Fuel EX8 '09
Trek Fuel EX8 '09
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other wise read park tools and do it yourself. sounds like the bottom stop is not correct and the tension slightly low if normal mech. and tension high if rapid rise.
Parktools :?:SheldonBrown
Trek Fuel EX8 '09