There are lots of different online performance tests: 


Google PageSpeed Insights 
iWebTool Speed Test
AlertFox Page Load Time 
WebPageTest


Also there are several desktop/client software such as: 


ping tool
YSlow
Firebug's Net console
Fiddler
Http Watch


I just want to decide if my hosting provider has a good enough performance or if I need to switch my hosting to another provider.

So, which tool should I use to compare my hosting provider with other hosting providers?


Question: What to do with old connections when moving outlet to dedicated circuit?
Answer: Your best option, after having read the comments you provided, is to put a new branch circuit in for the Microwave, even though it is more difficult in your particular circumstance.  The microwave should have a 20amp circuit, because it runs at over 13 Amps.  14AWG wire is rated for 15 Amps, but for continuous loads the rating drops to 12 Amps (80 percent of non-continuous per NEC 210.20(A)).  You should also protect this new circuit with an GFCI outlet, especially if it is near a sink/water. Leave the 14 AWG wires connected in the back of the box so they feed the other outlets.