Also have this problem - on Linux Mint 19.3, XFCE with a Samsung S7. This worked fine under Mint 17.1 - listing 3500 jpeg files took 20 seconds; usually less. Now when trying to read the same directory which is now only 2500 jpeg files, both Thunar and PCMANFM take > 20 MINUTES to generate a file listing - a slowdown by a factor of 60 for a thousand fewer files. But once the listing shows up, I can scroll and do file transfers just fine. Directories of only a few hundred jpegs on the phone come up almost instantly. I can't get a more recent version of the libmtp than 1.1.13 from the repository, and I get errors that state "Dependency is not satisfiable: libmpt9(=1.1.17-2)" when I try the other solutions mentioned previously.
This is a deal breaker. Downloading pictures from my phone is one of the most common operations I perform. At this point, I may have to reconsider going back to Windows 10, which at least gets the job done - it takes roughly 40 seconds to do the directory on those 2500 files.
Also have this problem - on Linux Mint 19.3, XFCE with a Samsung S7. This worked fine under Mint 17.1 - listing 3500 jpeg files took 20 seconds; usually less. Now when trying to read the same directory which is now only 2500 jpeg files, both Thunar and PCMANFM take > 20 MINUTES to generate a file listing - a slowdown by a factor of 60 for a thousand fewer files. But once the listing shows up, I can scroll and do file transfers just fine. Directories of only a few hundred jpegs on the phone come up almost instantly. I can't get a more recent version of the libmtp than 1.1.13 from the repository, and I get errors that state "Dependency is not satisfiable: libmpt9(=1.1.17-2)" when I try the other solutions mentioned previously.
This is a deal breaker. Downloading pictures from my phone is one of the most common operations I perform. At this point, I may have to reconsider going back to Windows 10, which at least gets the job done - it takes roughly 40 seconds to do the directory on those 2500 files.