Answer Posted / prity.r

Performance testing is the process of determining the speed
or effectiveness of a computer, network, software program
or device. This process can involve quantitative tests done
in a lab, such as measuring the response time or the number
of MIPS (millions of instructions per second) at which a
system functions. Qualitative attributes such as
reliability, scalability and interoperability may also be
evaluated. Performance testing is often done in conjunction
with stress testing.
Performance testing can verify that a system meets the
specifications claimed by its manufacturer or vendor. The
process can compare two or more devices or programs in
terms of parameters such as speed, data transfer rate,
bandwidth, throughput, efficiency or reliability.

Performance testing can also be used as a diagnostic aid in
locating communications bottlenecks. Often a system will
work much better if a problem is resolved at a single point
or in a single component. For example, even the fastest
computer will function poorly on today's Web if the
connection occurs at only 40 to 50 Kbps (kilobits per
second).

Slow data transfer rate may be inherent in hardware but can
also result from software-related problems, such as:

Too many applications running at the same time
A corrupted file in a Web browser
A security exploit
Heavy-handed antivirus software
The existence of active malware on the hard disk.
Effective performance testing can quickly identify the
nature or location of a software-related performance
problem.

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