# VS2015 intelisense so slow **URL:** \ **Category:** C++\ **Tags:** vs2015, unreal-engine, UE4, CPP, question\ **Created:** [December 15, 2015, 7:52am UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499 "2015-12-15T07:52:19Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![HamsterIsComing](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HamsterIsComing](https://forums.unrealengine.com/u/HamsterIsComing)\ **Post date:** [December 15, 2015, 7:52am UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/1 "2015-12-15T07:52:19Z")
hello. I’m using unreal engine4 and c++ when I type any letter, itelisense list is not appear. over 10seconds later , the lists are appear. [\>please watch my video (youtube link)][1] it is too slow. Is everyone same speed?? If not , How can I fix this? thank you [1]: ---
**Author:** ![anonymous\_user\_ef23e124](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_ef23e124](https://forums.unrealengine.com/u/anonymous_user_ef23e124)\ **Post date:** [December 15, 2015, 8:48am UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/2 "2015-12-15T08:48:33Z")
Hmnyari, Same here, it would be easy to rename Intellisense to either IntelliNONsense, or Intellipain! Besides just being painfully slow, half the time, it’s telling me there are no errors when errors exist, etc. Nor do changes to plugins seem to get reloaded so having to close UE4, and start it back up all the time. ---
**Author:** ![HamsterIsComing](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HamsterIsComing](https://forums.unrealengine.com/u/HamsterIsComing)\ **Post date:** [December 15, 2015, 2:48pm UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/3 "2015-12-15T14:48:52Z")
yes it is IntelliNONsense. unity + monodevelop + c# has super fast intelisense so sad… ---
**Author:** ![anonymous\_user\_ef23e124](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_ef23e124](https://forums.unrealengine.com/u/anonymous_user_ef23e124)\ **Post date:** [December 15, 2015, 3:21pm UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/4 "2015-12-15T15:21:41Z")
Eh, Eclipse is fast, so are a lot of other IDE’s. Intellisense is just abysmal. Especially when you start watching it, constantly reparsing the includes. When your waiting, for VS2015 to actually respond, take a look at what its doing, most of the time (not all the time), it will say in the status line, that it’s off scanning, or parsing. ---
**Author:** ![HamsterIsComing](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HamsterIsComing](https://forums.unrealengine.com/u/HamsterIsComing)\ **Post date:** [December 16, 2015, 8:34am UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/5 "2015-12-16T08:34:38Z")
oh! is Eclipse fast? could you please tell me how use eclipse for UE4? is Eclipse support UE4 default setting? or install something else? ---
**Author:** ![anonymous\_user\_ef23e124](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_ef23e124](https://forums.unrealengine.com/u/anonymous_user_ef23e124)\ **Post date:** [December 16, 2015, 8:57am UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/6 "2015-12-16T08:57:06Z")
Eclipse can be fast, and if you load it up with all the plugins available for it, you can slow it down considerably. The problem is, i’m about done, building a plugin and blueprints for sale on the UE4 marketplace, and haven’t had the time to see what would need to be done to get Unreal Build Tool (UBT) to work with eclipse, etc. So I really cannot help there, BUT Here is what I have done to VS2015 in order to speed it up, since you posted, none of this I came up with, I found it scrounging around through a lot of posts here in the answerhub, and the forum, and I almost must say, that your mileage may vary, as some of the posts/forums, indicated it helped some people, and not others. It certainly has helped me. 1. If you are not using source control, then turn it OFF in VS2015! To do this, 2. These steps can turn off some of Color highlighting, but if you can live with that. I’m pretty sure that’s all I changed, I played with some turning off some other stuff, but found it had no effect. When you Disable Auto Updating, you will also turn off Intellisense Squiggles Which was fine by me, because well, the “squiggles” were generally in error… Have fun! ---
**Author:** ![V0ldek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@V0ldek](https://forums.unrealengine.com/u/V0ldek)\ **Post date:** [August 9, 2016, 5:35pm UTC](https://forums.unrealengine.com/t/vs2015-intelisense-so-slow/341499/7 "2016-08-09T17:35:08Z")
I know this is a really old post, but I was struggling with this for quite some time and finally found a solution! So, to any of you out there that struggle with the impossibly slow Intellisense, head down to this link: > **[For those who suffer from Visual Studio IntelliSense slowness](https://forums.unrealengine.com/showthread.php?93546-For-those-who-suffer-from-Visual-Studio-IntelliSense-slowness)** > > \*\*tl;dr \*\* go to Project\>\>“project\_name” Properties\>\>NMake on the left sidebar\>\> put /Yu in the Additional Options under IntelliSense Confirm then Visual Studio will start generating pre-compiled header file specifically for...