I am developing a web app with 1280px width. Planning to keep 1024 for content and remain as Menu with fixed position. On scrolling main content the menu will not scroll.
Will this be a good for user exp?
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It sounds to me that because the menu is on the side it will occupy its space whether its there or not?
If this is the case I would definitely consider implementing it as a sticky component. This because the space allocated to the content will be the same whether the menu sticks to the scroll or not.
This will enhance the accessibility of the user controls without obstructing the main content.
If the menu was located at the top however we would have a different scenario and then the considerations Fresheyeball brought up definitely comes into play.
Surely - as a user I never like sites where one has to scroll to the top just for a click to be taken to the next page. Of course the content of the site is important, but if the user is not looking for the content on the page, that page irritates him and he would not walk an extra mile in finding the right page on that site and instead move on.
In the case of lengthy content, another idea - if considerable in your case - could be a side panel which expands on click. This would give you ample space on the screen for the content and at the same time the user would have the menu available at anytime.
I think your targeted device are desktop & laptop with resolution more than 1024 by 768. Keeping menu fixed is a good option but, for future you should add a scrollbar to menu(as nowadays done by most of ipad apps. e.g: Facebook app). So that if in future number of links increase it will not be a problem for you. According to me you should be ready for future changes & enhancement to be done.
It depends on the usefulness of the menu. If it's extremely likely to be used frequently, yes, definitely good UX. However, you have to consider the size of the menu versus the total screen real-estate. If you are targeting a mobile device or small screens and your menu bar is too big, the loss of screen real estate may out-weigh the convenience of the menu's persistence.
Rule of thumb is that the top 18% of controls should be maximally accessible, but again, are you willing to sacrifice the space?