Hi there i have an Apollo Mountain bike it runs great and looking for suitable upgrades for road use

I have just installed City jet 1.5 Road Tyres and had the Bottom Bracket replaced to a sealed unit as it became loose other then that the bike has worked fine the other half bought me it 2 years ago i was worried when i seen Apollo but it surprised me when it worked well and i rearly push it on the road 5 days a week

Now question at hand is there anything else i can upgrade or remove to make it faster lighter i am a skinny guy 5.9 12 stone
i have mud guards and bar ends for extra grip and a bottle rack the parts seem basic so in time i will upgrade any parts that either break or are cheap to install

Anything here thats rubbish

Approximate Weight (KG): 16.2kg
Brake Type: V-Brakes
Frame Material: Steel
Gender: Mens
Number of Gears: 18
Pedals Included: Yes
Suspension: Front Suspension
Wheel Size: 26"
Chainset: Square Taper
Fork Lock-out: No
Forks - Adjustable damping: No
Frame: Steel
Front Brake: V-Brake
Front Hub: Steel
Front Mech: Yes
Gear Shifters: SRAM Grip Shift
Handlebars: Black Steel
Headset: 1" 1/8 Caged Bearing
Pedals: Black
Rear Brake: V-brake
Rear Hub: Steel
Rear Mech: Shimano
Rims: Alloy Single Wall, Black
Saddle: Black Apollo
Seatpost: 350mm
Stem: Black Steel
Type: Mountain Bikes
Tyre Size: 26" x 1.95
Tyres: MTB Tyres 26" x 1.95"

Thanks in a year or two i will definitely buy a Road Bike but for now with the Baby considering a New Road bike is out of the question :-P

Thanks

Joe