[Bug 49595] New: WINE hogs CPU when editing text files >1MB in WinSCP

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49595

Bug ID: 49595
           Summary: WINE hogs CPU when editing text files >1MB in WinSCP
           Product: Wine
           Version: 5.13
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Steps to reproduce:

1. Get WinSCP 5.17 from winscp.net
2. Connect to a Linux box.
3. Look for a text file >1MB (e.g. sth. in /var/log)
4. Right-click on it and choose edit.

Result:

WinSCP is 70x slower than a Windows VM on a 1MB logfile.
WinSCP freezes on a 20MB logfile.

Examples for comparison:

Loading a 1MB logfile in Windows VM -> 0.5 seconds
Loading a 1MB logfile in WINE -> 35 seconds

Loading a 20MB logfile in Windows VM -> 20 seconds
Loading a 20MB logfile in WINE -> still 100% WINE CPU load after 5 minutes,
WinSCP frozen, needs to be killed