General synonyms:
* Effectively
* Productively
* Successfully
* Adeptly
* Skillfully
* Expertly
* Diligently
* Methodically
* Smoothly
* Effortlessly
* Economically
More specific synonyms:
* For time: Expeditiously, rapidly, promptly, swiftly
* For resources: Economically, frugally, sparingly
* For effort: Effortlessly, smoothly, seamlessly
* For results: Effectively, successfully, productively
The best synonym will depend on the specific meaning you want to convey.