There is an issue with Mono on Linux where a memory leak in one of the Mono libraries will eventually deplete all your system memory. Running under VirtualBox with 1GB of RAM, after about 4000 acquisitions the system memory will be low enough that a crash/hang of the OS is coming.
The solution is outlined below at the wiki link, and involves updating to Mono 6.12.0.182 (which also greatly improves performance) and then updating the LibGdiPlus version 6.0.4 to version 6.0.5. In the screenshot you can see >10K acquisitions and memory isn’t depleting with every acquisition.
