This is because initializing and allocating large files on flash-based media consumes a greater amount of time and resources compared to a conventional hard-drive.
When running the portable edition from a USB flash drive, especially one that is formatted in FAT16/FAT32, you may experience some lag when initially loading a new transfer.
(The executable binaries are actually the same as the standard edition binaries.) This file is what triggers Tixati to run in portable mode. It is important you do not delete the 'tixati_portable_mode.txt' file within the executables folder. It stores all its configuration files in the same folder as the executable binary files, and all file paths are stored in a format relative to the program executable folder. Tixati portable version is meant to run on a USB flash drive or other portable media. And unlike many other clients, Tixati contains NO SPYWARE, NO ADS, and NO GIMMICKS.
Tixati is one of the most advanced and flexible BitTorrent clients available. Also included are powerful bandwidth charting and throttling capabilities, and a full DHT implementation. Tixati is a free and easy to use BitTorrent client featuring detailed views of all seed, peer, and file transfer properties.