testmy.net by default runs a test to servers in Japan. Speedtest.net will find a local server. So basically the results you got show the difference between downloading a file from a Thai server compared to one outside the country. As mentioned above there are limited connections from Thailand to the international internet and that slows things down.
As Line reduces all pictures sent in quality/size (including removing meta data so you lose location info) I have given up storing them on my PC. Instead I allow them to automatically backup to Google Photos. Its free as line pictures fall well below Photos size threshold. Also easy to access from a PC or any other internet connected device. Plus Photos using facial recognition allows sorting by people and it has albums. Any decent pictures your wife takes I would get her to email them to you in original format.