Yeah, there have been complaints about this.
Check preload sounds option. Not sure how it works in latest version, but sounds could be loading before the actual loader layout resulting in a long wait. Which is insane actually. Sounds should load at the same time images are loaded, after you see the custom pre loader layout.
Solution, not to preload sounds, I guess ( pre-load each sound without playing somewhere after loader layout shows up and before you actually need them )
Second thing to check is spritesheeting. For example I use sprite fonts to display loaded percentages, but if I use the same sprite font elsewhere in the game Construct will, on export, bundle this sprite font with some huge ass background images, or whatever it feels like doing, so again, a longer than necessary wait to load images not needed to see the loader layout
Solution: set max sprite sheet size to 1024 ( if it does not affect the rest of the game ) or use a different sprite font only for loader layout ( or basically make sure somehow that first loader layout images are not on the same sprite sheet with some other huge images from the rest of the game ).