Slow response issue

Are the images being optimized for the web.

It could be your home computer is just a lot more powerful than your "server." What kind of server is it? Is it dedicated or shared? How much ram? What cpu? Start by comparing the hardware it's running on. If it's shared hosting, you're sharing the cpu/ram with others and get even less out of the server than the raw specs would show.

And just to add to the list, it might be the upload speed of your internet as well :)

it may be the network speed or latency also...

@cronix it's a vps..

I typed free-m and I got this following result

                   total        used        free      shared  buff/cache   available
                    1952         312         782          34         856             1400

These are some hardwaare informations of CPU

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Model name:            Intel Core Processor (Haswell, no TSX)
Stepping:              1
CPU MHz:               2992.946
BogoMIPS:              5985.89
Virtualization:        VT-x
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
NUMA node0 CPU(s):     0