Modes
You can set up plug-ins in synchronous or asynchronous mode. Synchronous mode starts the execution of the plug-in when the event is fired and blocks the CRM application process until the executed method finishes. This option is not recommended if you are performing a process that might take a long time to execute. Regardless of the method used, synchronous or asynchronous, a timeout limit of 2 minutes applies for plug-in executions. If your process needs more time, you will have to consider using a workflow or another custom background process.
Tip
If you want to prevent a record from being created or updated, this should be the desired mode in conjunction with the pre-stage (see the next section, “Stages”).
Asynchronous mode releases ...
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