Get freeware Autoruns that will graphically list every startup process and author making unchecking easy targets harmless and reverting back simple process.
Look for auto-updater combing through every application's options or preferences and deselect all. Both startup processes and auto updaters account for majority of slow desktop launches.
Avoid messing around turning off Services, that is far riskier wrecking total havoc on functions.
It's a simple fact that tablets, by design have many more services in use (50 and higher) than desktop users as used to expecting.
Focus on the two mentioned above and reduce the number of feature apps loaded in taskbar. Some are far better designed and sip little resources and others are huge pigs pulling down the whole OS sitting doing nothing. Task Manager observation reveals those.