Method to speed up vba scraping (POST request) - json

Question

I have made a web scraper using vba and JSON Parser library.
My code is as below, and it works fine.
Sub Setcustoms()
Dim JSON As Object
Dim ws As Worksheet, results(), i As Long, s As String
Dim shipvalue As String, custom As String, MyURL As String
Dim BL As String, returnshipvalue As String
Dim a, b As Variant
Dim mytext, finaltext As String
Dim myvalue As Object
Dim country() As String
Dim year As String
country = Split("NL,DE,MY,US,VN,UA,ID,JP,CN,CL,CA,TH,PL,RU,PH", ",")
'country = Split("MY,VN", ",")
Dim port() As String
port = Split("KRKAN,KRKUV,KRTSN,KRPUS,KRYMH,KRINC,KRPTK,KRKPO,KRKCN,KRBNP,KRUSN", ",")
'port = Split("KRKAN,KRKUV", ",")
Application.ScreenUpdating = False
i = 2
For Each a In country
For Each b In port
With CreateObject("MSXML2.XMLHTTP")
.Open "POST", "https://www.bandtrass.or.kr/customs/total.do", False
.setRequestHeader "Accept", "application/json, text/javascript, */*; q=0.01"
.setRequestHeader "User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36"
.setRequestHeader "Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"
.setRequestHeader "Accept-Encoding", "gzip, deflate, br"
.send "SELECT_DIV1=PORT_DIV&GODS_TYPE=H&ECONO_TYPE=undefined&PORT_TYPE=B&LOCATION_TYPE=undefined&FILTER1_GODS_UNIT=&SELECT_DIV2=NATN_DIV&FILTER2_GODS_UNIT=&SELECT_DIV3=GODS_DIV&FILTER3_GODS_UNIT=10&POP_TABLE=&COL_NAME=&EXCEL_LOG=&MENU_CODE=CUS00301_POP&EXCEL_SUBJECT=&SelectCd3=4401310000" + _
"&SelectCd1=" & b & "&SelectCd2=" & a
mytext = Right(.responseText, Len(.responseText) - 44)
finaltext = Replace(Left(mytext, Len(mytext) - 2), "\", "")
Set JSON = JsonConverter.ParseJson(finaltext)
For Each myvalue In JSON
If Len(myvalue("BASE_DATE")) = 5 Then
year = myvalue("BASE_DATE")
Else
If myvalue("IM_WGHT") <> "" Then
Cells(i, 2).Value = DateSerial(CInt(Left(year, 4)), CInt(Left(LTrim(myvalue("BASE_DATE")), 2)) + 1, 0)
Cells(i, 3).Value = a
Cells(i, 4).Value = b
Cells(i, 5).Value = myvalue("IM_WGHT") / 1000
If myvalue("IM_WGHT") <> 0 Then
Cells(i, 6).Value = myvalue("IM_AMT") * 1000 / myvalue("IM_WGHT")
i = i + 1
Else
End If
Else
End If
End If
Next
End With
Next
Next
Application.ScreenUpdating = True
End Sub
The only issue I have is that the scraper takes about 10 minutes to finish.
I would really want to speed up the process since I will be updating the data on a monthly basis.
Another viable option is that I can scrape through the recent months, but in that case I have to rewrite the whole code.
Is there any possible method to speed up the process?
Thank you.