What are symptoms of flash memory degradation

I have a 2011 Macbook Air with 250GB of flash memory.
I have since Yosemite been experiencing significant slowness in typing into both Numbers and Pages documents.  Like over a second per character at times.
- I have suspected iCloud (I do open the documents on my iphone 6 and keep the application in a non terminated state). 
- I have suspected new releases of Numbers, of Pages, and of OSX with Yosemite.
- I have also suspected not having enough Flash memory to support the applications
Recently (today) I removed the Flash Drive, and installed an OWC 480GB drive.   Since the reinstallation, both Numbers and Pages have not shown any slowness when typing (I will update this after I get a couple more days of experience).   In fact, the whole systems seems quicker.   I am concluding
1.  The available storage on the old flash (<10%) slowed the system down; or
2.  The original Flash, after three years of daily use, had degraded to a point of producing the symptoms of slowness.
Has anyone else experienced degradation in software (notably Pages and Numbers) and has found a solution?

Once you installed the new SSD, did you clone your existing drive or start with a fresh OS X installation?  If it was a fresh install, then you simply will not be able to determine what caused the performance increase back to normal.  If, however, you cloned the drive, then I would suspect that it was the fact that you had so little space left on the drive.
If I reached the point of 10% or less available storage (25GB in your case) I would expect to start seeing degradation of performance on any hard drive.  Actually, it all depends on what size files you typically deal with.  If you commonly store (or update) large media files to your SSD then less than 25 GB available space is a significant limitation that makes the file system's job or preventing significant fragmentation impossible.
Also, one issue that many users do not understand is the repercussions of upgrading your iCloud storage.  If you do so, please realize that iCloud will attempt to store all of your iCloud data to your MacBook Air's SSD even if it completely fills the drive.  This has been the downfall of may users that don;t realize this.

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