Server snmp and modbus

I need to configurate server Ubuntu and this server reads:

Protocol Provider Model
SNMP A MICROWAVE (3 TAG) ANALOG AND DIGITAL INPUT
MICROWAVE (5 TAG) ANALOG AND DIGITAL INPUT
MICROWAVE 200 (3 TAG) ANALOG AND DIGITAL INPUT
SNMP B sWITCH (3 TAG) ANALOG AND DIGITAL INPUT
sWITCH (2 TAG) ANALOG AND DIGITAL INPUT
sWITCH (2 TAG) ANALOG AND DIGITAL INPUT
sWITCH (2 TAG) ANALOG AND DIGITAL INPUT
SNMP C sWITCH (1 TAG) (11 EQUIPMENT) ANALOG AND DIGITAL INPUT
SNMP D sWITCH (3 TAG) DIGITAL INPUT
SNMP E sWITCH (1 TAG) DIGITAL INPUT
sWITCH (1 TAG) DIGITAL INPUT
SNMP F sWITCH (2 TAG) DIGITAL INPUT
SNMP G SERVER 1 (4 TAG) ANALOG AND DIGITAL INPUT
SERVER 2 (4 TAG) ANALOG AND DIGITAL INPUT
SERVER 3 (2 TAG) ANALOG AND DIGITAL INPUT

ALSO

MODBUS H PROTECTION (60 TAGS) ANALOG, DIGITAL INPUT AND DIGITAL OUTPUT
I PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT
J PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT
K PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT

MODBUS L PROTECTION (60 TAGS) ANALOG, DIGITAL INPUT AND DIGITAL OUTPUT
M PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT
N PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT
O PROTECTION (10 TAGS) ANALOG AND DIGITAL INPUT
MODBUS P PLC (10 TAGS) ANALOG AND DIGITAL INPUT

I HAVE A PC WITH I3 8 RAM 1 T HDD AND :
Question 1
When configure server snmp in centos 7 with zabbix server is too slow with direct connected but when connected in browser run OK
is possible the same result my read in snmp is 5 second

Question 2
All scada reads in 1 seconds with my pc is possible to read ALL my tags??

Question 3
Is recommended polling every second for all my equipment?

Question 4
how recomended to write in database?

Question 5
The computer will work ok because all tasks???