The performance of a mobile device is relative rather than absolute, since it depends on the utility the user requires of it.
It could be that the space remaining on the storage is low or the ram is too small.
Often times, users tend to load their devices with tonnes of applications not considering the RAM size, available memory of the device, these applications may be space demanding and expensive, and in the long run lead to the low performance of the device.
Learn more about Mobile device specification here:
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I agree with this theory to some degree mostly do to the fact that public schools are the main way to learn in most countries
Undercut studs have a shank equal to the pitch diameter of the screw thread.
Code that specifies how the web page should be formatted
A file format that provides an electronic image of text or text and graphics that looks like a printed document and can be viewed, printed, and electronically transmitted.
a file in PDF format.
"I sent him a PDF of the article"