For 'time-consuming', I tried http://thesaurus.com/browse/time-consuming.
For 'less time-consuming', I tried researching synonyms for 'productive' (http://www.merriam-webster.com/thesaurus/productive).
But none of the above results pertain to time.
Example of '(less) time-consuming' upon request:
As Googling each bus route (e.g. in Hong Kong, London) is too time-consuming, what are some less time-consuming methods to see all the bus routes on the same map?