You can instantly finish construction and research queues using gold
When construction is already started or when the research is already in process, a gold button appears. To instantly finish press the "complete construction immediately" button.
A confirmation window will open and after confirming, all running constructions together with all research in the village are completed in an instant. This instant completion costs 2 gold.
Note: Keep in mind, that celebrations, buildings in the master builders’ queue or training of any troops are neither research nor construction.
Exceptions
Due to gameplay reasons, there are some exceptions where instant finish cannot be used, these are: The Residence, Palace, and Command Center which are excluded from this function. The same applies to World Wonder villages and the World Wonder itself which also cannot be instantly completed.