This page of ReSharper options summarizes general settings of the ReSharper environment.
Loop selection around ends of a list
If this check box is selected, any time you scroll a pop-up list selection with keyboard arrow keys, ReSharper loops the scrolling. This option applies for the set of Navigation and Search and Code Completion (IntelliSense) features where pop-up lists are used.
Show managed memory usage in status bar
If this check box is selected, the amount of managed memory used by the whole process is shown in the rightmost position of the status bar. This value indicates not only the amount of managed memory used by ReSharper but also the amount of managed memory used by other third-party plug-ins and Visual Studio itself.
Show 'Report error' dialog...
If ReSharper encounters an internal exception, by default it shows a notification in the status bar but does not interrupt your work (if it is still possible). You can click the notification icon later to review exception details and submit them to JetBrains in a modal dialog.
Application icons theme
These radio buttons help switching between different sets of ReSharper UI icons. You can leave the default option of automatic selection or choose an icon set that will be most comfortable for you for the selected Visual Studio theme.
Source code symbol icons theme
These radio buttons help switching between different sets of code symbol icons. You can leave the default option of automatic selection or choose an icon set that will be most comfortable for you for the selected Visual Studio theme. You can feel the difference between different sets by using Go to features or Exploring Type Hierarchy. See Symbol Icons for a comprehensive list of symbol icons.
Store solution caches in
ReSharper caches a lot of its temporary data. For example, results of code analysis. If you do not share the solution, you can choose solution folder. If you share your solution using a VCS, it is better to choose the system temp folder so that ReSharper gets them out of the solution folder and therefore out of the way of your VCS. It is recommended to choose a custom folder. The problem with the 'User local settings folder' (%LOCALAPPDATA%) is that Visual Studio's directory watcher could be triggered when ReSharper writes to this folder, which happens very often.
Clears the cache of the current solution.
Use MSBuild to obtain project references and generated file
This selector allows you to define whether to call MSBuild to analyze project references in web projects or projects that have NuGet references. Results of this analysis are used by code inspection and other features. If you choose the Do not call MSBuild, then these features may not work correctly. If you choose one of the two remaining options, then some performance degradation is possible.