ubuntu 16.04.01 slow typing

My wireless logitech keyboard and mouse (K270) is often to slow when I'am typing the words are coming very often later on the screen, but the strange thing is not always (as now it is working fine). Had more or less the same problem with ubuntu 14.04.4 (at least the last version). Is the ubuntu to heavy for the computer? Desktopcomputer
product: A780L3C (To Be Filled By O.E.M.)
vendor: BIOSTAR Group
serial: None
width: 32 bits
capabilities: smbios-2.6 dmi-2.6 smp-1.4 smp
configuration:
boot = normal
chassis = desktop
cpus = 2
family = To Be Filled By O.E.M.
sku = To Be Filled By O.E.M.
uuid = 00020003-0004-0005-0006-000700080009

with CPU:
CPU
product: AMD Athlon(tm) II X2 240 Processor
vendor: Advanced Micro Devices [AMD]
physical id:
4
bus info:
cpu@0
version: 15.6.3
serial: To Be Filled By O.E.M.
slot: CPU 1
size: 2800MHz
capacity: 2800MHz
width: 64 bits
clock: 200MHz
capabilities: x86-64 boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp 3dnowext 3dnow constant_tsc nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save cpufreq
configuration:
cores = 2
enabledcores = 2

With 4Gib internal memory

Ore is it the usb wireless for the keyboard and mouse?

I hope someone can help me out in this.

Thanks beforehand,

Gerlof.