Try to see the chord as a single item, as opposed to multiple notes for which you need to spell out each one. When we first learn to read text we learn the alphabet, then we learn how to put characters together in order to form words. At first we spell out each character of a word in order to decipher it, but as our skills improve we learn to read words as a whole. We progress to thinking of a group of characters as a single word and its associated meaning, without the need to spell it out in order to decipher what it is. Similarly with chords in music, one needs to progress as seeing them as a single word.
The above suggestions on becoming familiar with scales, chords, arpeggios, and cadences in all keys is an important one. When you are familiar with these and they appear in a piece of real music, you will instantly recognize them and play them as a single entity as opposed to spelling out individual notes. The more keys you know, the more you will start to pick up on recurring patterns and how intervals, scales, chords, etc. look when viewing them on the score.