List some more efficient checkout methods in the README

README.MD

@@ -14,7 +14,34 @@ Make sure to check out the repository *recursively* since it uses [Git submodule
 git clone https://github.com/RagnarokResearchLab/CommunityProjects.git --recursive
 ```
 
-Be aware that *all* dependencies will be fetched, some of which are quite large. Several gigabytes of hard disk space will be consumed.
+Be aware that *all* dependencies will be fetched, some of which are quite large (several gigabytes).
+
+If you aren't interested in getting the complete commit history, you can speed up this process:
+
+```bash
+git clone https://github.com/RagnarokResearchLab/CommunityProjects.git --recursive --shallow-submodules
+```
+
+To further reduce the time needed to clone, you may want to skip nested dependencies as well:
+
+```bash
+git clone https://github.com/RagnarokResearchLab/CommunityProjects.git --shallow-submodules
+```
+
+Finally, you could override the parallelism factor, which defaults to an overly conservative value:
+
+```bash
+git clone https://github.com/RagnarokResearchLab/CommunityProjects.git --shallow-submodules --jobs=8
+```
+
+The difference will be quite signitifcant, as shown by the following comparison table:
+
+| Recursive | Shallow | Jobs | Time | Disk Usage |
+| :---: | :---: | :---: | :---: | :---: |
+| NO | NO |  0 (auto) | 0.929 sec | 246 KB |
+| YES | NO | 0 (auto) | 8 min 4 sec | 4.8 GB |
+| YES | YES | 8 | 3 min 58 sec | 3.1 GB |
+| YES | YES |  0 (auto) | 5 min 56 sec | 3.1 GB |
 
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