Je was op zoek naar: a long time (Wels - Engels)

& hidl: make a very small file, but take a long time saving
fast

& priodweddauthe compression will take a long time; saving the file will be slow.
compress:

climate change is a long-term change in the average weather patterns
climate change

ef oedd awdur yr adroddiad ` securing our future health : taking a long-term view ', a arweiniodd at ryddhau cryn dipyn o arian newydd ar gyfer iechyd gan ganghellor y trysorlys
he was the author of the ` securing our future health : taking a long-term view ' report , which led to the release by the chancellor of the exchequer of substantial new funding for health