(You can disable it by double-clicking that little green or red dot in the lower-left corner of the screen, then turning off the On checkbox in the Preflight panel that appears.) I almost always leave it on, but if youвЂ™re running into slowdowns, itвЂ™s definitely worth turning it off. But there is plenty of anecdotal evidence that preflight can get in the way. Adobe insists that Preflight only works in the background when youвЂ™re not working, so it should not slow you down. If you have created a custom preflight profile, then it may be looking for lots of different things. InDesign is constantly looking at your document to see if there are any вЂњpreflight errors,вЂќ such as overset text. Normally, on a reasonably fast machine, those shouldnвЂ™t slow ID down, though. InDesign also has other display modes that could potentially slow it down: view > proof color, and view > overprint preview. If youвЂ™re working in Typical and it still seems like one or more images are in high-quality mode, then those images may have display quality overrides applied to them you can disable those from the Display Performance submenu. Obviously, the higher the quality, the more InDesign has to think, and the slower itвЂ™ll become. There are three main display modes in InDesign - Fast, Typical, and High Quality (under View > Display Performance). (ThatвЂ™s 50 GB for a 500 GB drive!) InDesign relies on your drive because when it runs out of RAM it writes to the вЂњscratch diskвЂќ (this happens far more than youвЂ™d expect). Common wisdom says keep 10% of your drive free. Hard drive space can also be a cause of problems, especially if youвЂ™re working on a nearly-full drive. I would never try to run InDesign on a machine with less than 2 GB of RAM, and IвЂ™m forever cursing that my laptop with 8 GB is not enough (but IвЂ™m constantly running 5 to 10 programs, often including Photoshop, Illustrator, and Word). Enough memory? RAM is like air to an app like InDesign if you donвЂ™t have enough, it will be sluggish or even die.

There are many reasons why InDesign might be running slowly, but hereвЂ™s a quick rundown of things I would try in this situation, more or less in the order I would likely try them. Every little action has about a 5 second delay! It is not my computer, it is specifically inDesign. I am working on a brochure (40 pages, about 180 images).

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