Personally I think in a world with magic, that technology would evolve with it. Technology is the application of science, so once something is better understood (steam expands and makes pressure, or the concept of oxidisation, for example) then processes would come about using magic at its roots. So for example a steam engine could burn wood which needs constant replenishing and a lengthy supply chain or you could do either of these:
1/ Enchant a first level heat spell to make a piece of iron hot, which can be lowered into a tank of water.
2/ Summon and bind an imp
3/ Use ritual magic to open a small gate to a fire plane (for a large ship maybe).
All of these would produce far better steam engines. And then you can also summon water in to the boiler too. These can all be low level spells that would drastically alter a world once the science is understood. I believe however that in a world of magic there would be less of an imperative to study it. The smart people are probably all spell casters. Kinda like our world, where the smartest people go to do law not economics
I also think that if we had magic come to this relatively high tech world then we could get a lot more bang for the buck than a primitive spell caster. Making optimum use of every tenth decimal place of mana would be the thing.
- healing might be done by surgeons using precision robotics, why use 50th level spells when you can cast 20 first level ones in exactly the correct place, ie from inside the body. So instead of Heart Repair, you can do an angiogram and do a minor tissue repair on the flesh that happens to be the heart.
- electronics manufacture would be enhanced with magic, getting down to single digit nano path ways in CPU's etc.
- construction could be greatly enhanced with earth / stone to mud type spells, especially in ritual/item forms. ie converting 100 tonnes of granite to "mud" for an hour, pour into the mold and wait for it to set.
This is a bit off topic I know, but it is an interesting thought bubble