Download fast using dispatch queue

Question

How to increase the downloading speed in an app using dispatch queue ?

I am using dispatch queues to download images in my app but it takes time when it is downloading for the first time as after that I am storing them into cache. But I want to download them faster for the first time too.

Can anybody suggest me a way for this to use with the dispatch queues?

Answer 1

In my opinion, you can use a queue with high priority and then the system will take a decision. I do not think you can do more with grand central dispatch

dispatch_queue_t q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)

Use this queue to download operations.

Oficial Documentation

Queue isn't threads, system manages threads. You can use a queue with priority or concurrent queue (good idea Kyokook Hwang) and the system will decide the best performance.

Answer 2

If you want to increase downloading speed of each image, I have no idea to make it with GCD.
But, I think that you had better use a concurrent dispatch queue rather than a serial queue if you are using a serial queue to download them.