Deactivate the X-Plane low frames rate warning
X-Plane warns when the FPS rate is too low. FSImp, when loading tiles and/or bitmaps as quickly as possible, allows the FPS rate to drop to a programmable level. This may trigger the X-Plane low frames rate warning. To deactivate this warning, select the X-Plane menu Settings >>> Operations & Warnings and then uncheck the item called warn of low frame rates.

Use the X-Plane pause key (usually p)
When the sim is paused, FSImp can make use of the time to load bitmaps and interpret BGL files more quickly. If scenery objects are not ready (empty) or if bitmaps are not yet loaded (grey models) then pause the sim for a short while so that FSImp can catch up.

Keyboard input focus
When a dialog input field has the input cursor (focus) most keystrokes are directed to the input field. To use the keyboard for simulation again you have to remove the input cursor from the input field. Do this by clicking once or twice on a non-input field in the dialog.

Dialog box focus
When one dialog box has the focus and you press a button or checkbox on another dialog box then this dialog box takes the focus but the button/checkbox press is ignored. You must press the button/checkbox again for the action to take place.

Editing dialog input fields
You can use the mouse to place the insert cursor anywhere in the text of the current input field. The UP arrow key places the insert cursor at the start, and the DOWN arrow key places the insert cursor at the end of the text. These can be useful if the text is wider than the input field.

FSImp plugin for X-Plane