How to Import WordPress eXtended RSS (WXR ) Big Files?

We often to import post to wordpress via the tool of Import WordPress, if we import big files, we always meet errors. How to resove this issure then? Let me share a skill with you.

Use 7-zip to GZIP your exported file, usually a 30 MB file down to just about 3 MB. Then try to import this gzipped file, many web hosting can import and unzip such files.