Large files in file analysis cause slowdown

[kimgerdes]

If the text files get bigger, the system gets very slow, nearly unusable. For example if you take https://gerdes.fr/FILES.zip unzip them and + from Folder choosing the unzipped folder, the import into the database already takes a lot of time. Follow-up clicks on the squares in the section map are delayed.
In some cases, the order of the two imported files doesn't correspond to the tooltips over the squares.