Check to cache Blur data URI in localStorage to save HTTP requests on the next requests. Uncheck if using localStorage for more custom important stuffs. Core localStorage providers vary 0.05KB - 150KB, to a tentative amount of 739.07 KB. This option will obviously hit the limit anytime (says 40KB x 100 images = 4000KB), can be larger given non-optimized or large Blur image style. However, configurable at <b>Thumbnail style</b> option, or Responsive image style fallback. That is why the smaller, file size and dimension, the more efficient. Will auto-clear, and recycle, when the quota (2-10MB) is exceeded.