iMovie makes fan very loud.

Is iMovie crashing or failing at all?

I think this is just the application doing what is required to do it's job…

iMovie will use CPU & the graphics processor to process the footage both will heat up & cause the fans to spin to cool the laptop. I also believe it will be switching to the discreet graphics card too, which uses more power & therefore generates more heat. Your Mac has multiple cores so seeing over 100% CPU is normal when an application has a lot of work to do.

Take it to an Apple store if you feel like it is a problem, however from your description it sounds more like you expect it to behave like the older model - they are different and will have different thermal and graphics processing capabilities.

If you are working on your lap or on a table consider raising it to see if it cools better. A laptop that overheats will crash or shutdown & possibly give warnings too.

You can find temperature monitoring applications if you really want to spend time working out what is going on but I suspect it is simpler to visit a store & compare to the same model with the help of a genius.

Its normal. CPU gets intensely hot due to all the encoding. Even playing chess will cause this. Try it 🙂

It appears normal if it is able to recover afterwords. Handbrake and application used to copy movie files from a DVD does a massive amount of coding and the fans on the Macs I've owned previously would kick into high gear while burning a movie.

kristof461 wrote:

I know that this kind of programs can use much CPU. But when I was using iMovie on non retina MacBook i have never heard fan. Maybe I will try export same video which I exported on my old MacBook. This could help to answer what is going on. If fan stars it means that something is wrong. Another question will be software (iMovie) or hardware issue. Also I will try export on new clear account.

Fans are there to do a job - cool the system when it gets hot to prevent hardware damage. You are assuming this is a problem - it is simply a hardware feature.

If the fans are too loud take it to an Apple store & complain. You have 14 days after purchase to return a product. After that you can only exchange if the store agrees there is a fault (you are describing something that sounds normal to me).

Your new Mac is different to the old one, you cannot assume the same task will behave the same on both systems unless they have identical hardware & software.

iMovie is a poor tool to use to compare hardware - it has far too many background tasks & things that are beyond your control (like detecting for shaky footage). Other tools can test the GPU & the CPU independently.