When connected to the PC directly, speeds ranged between 100MB/s and 150MB/s for DVD installs, and around 100MB/s for CD installs. Using a more recent version of HDLDUMP, speeds through USB3 improved to around 40MB/s - up from ~7MB/s, though this will certainly depend on the USB adapter. HDLBATCH attempts to combine the advantages of the above while addressing some of their shortcomings.
Moreover, Batcher was quite limited (had to install CD games separately, first DVD9 installs would always break due to a bug in the batch code). Still, who wants to have to install a Java runtime environment just for one app?! (I personally have no other use for Java.) Moreover, batch installs requires adding titles one at a time - ugh! Both Helper GUI and Batcher, however, seem to use HDLDUMP 0.9.0, which seems to be extremely slow when using USB adapters (for me, anyway ~7MB/s using a USB 3 SATA adapter). HDL Dump Helper GUI seems to be broken on more modern systems (claims of missing Java runtime environments despite the existence of one can still be launched via command-line with admin rights).
Batch installs can be done using HDL Dump Helper GUI or HDL HDD Batcher (the latter being a command-line interface). It is similar to HDLGameInstaller in terms of network installation, but seems to be slightly slower (~5MB/s). HDLDUMP is a command-line toolkit for installing and managing games, and HDLDUMB is a GUI interface for HDLDUMP, but lacks batch installation. HDLDUMP has a number of flavors: HDLDUMB, HDL Dump Helper GUI, HDL HDD Batcher.All games, including CD games, must be in ISO format. HDLGameInstaller is mainly a network installer, and is limited to about 7MB/s.However, it has a number of additional limitations: some games do not install properly, the partition naming scheme does not conform to specs outlined in the official SDK, it cannot handle 2TB drives, and as previously mentioned is limited to 255 games. By connecting the PS2 HDD drive to a PC, one could batch install games very quickly (up to a limit of 255).
For those using Open PS2 Loader (or HDLoader) with a Network Adapter and internal HDD, installing games can be a hassle.