Why is my website stuck? is it a system problem or a hardware problem?

Why is my website stuck? is it a system problem or a hardware problem? I am using a VPS server, memory 1 GB ECC, dual-core CPU, 70 GB hard drive, 3 M exclusive bandwidth, 4-wire, WIN2003 system
Because the website is still in beta testing, the number of concurrent online users does not exceed 10
Now the website is stuck for a while and sometimes gets stuck for a few minutes. you need to log on to the webpage again. I asked the server provider that the hardware configuration is too low, the CPU usage suddenly becomes very high when the card is used, and the server needs to be upgraded. I suspect it is a system problem. Is this a system problem or a hardware problem?

Reply to discussion (solution)

PHP code. The program is tested locally.

What do you want to see ?? ? Source.
Affection? Server? ? .

In Linux, let's look at the configuration... but this is not the case for a few people.

Request the URL .~~~~~~~~

It may be that vps is sold out.
If openvz is used, it can be sold out.
Xen kvm does not work
See which virtual technology it belongs.
Let's look at the execution time on the vps.

Please take a look at this... Http://www.bo56.com/%E5%96%84%E7%94%A8php-fpm%E7%9A%84%E6%85%A2%E6%89%A7%E8%A1%8C%E6%97%A5%E5%BF%97slow-log%EF%BC%8C%E5%88%86%E6%9E%90php%E6%80%A7%E8%83%BD%E9%97% AE %E9%A2%98/

If you have any queries, you can check the SQL statements on the current page. This may be the cause of bandwidth.

First check the browser to see which element is stuck and then hit the corresponding element in the background to check the performance bottleneck.

After changing the LINUX system, it will be fine. thank you!