The leasing of commercial property is first and foremost a business, and the speed at which eviction procedures may be accomplished has a powerful effect on a business's bottom line. To minimize possible delays, landlords should be cognizant of important procedural requirements and the necessity of a well-pled complaint. There are strict requirements for the content of and service of a three day notice "to pay rent or quit" or "to cure breach or quit" (required statutory notice before an unlawful detainer action may be filed). Because time is of the essence in most unlawful detainer actions, proper service and pleading is the best way to reduce the likelihood of delay. Otherwise, defendant tenants may file a motion to quash for improper service or demur to the complaint and/or move to strike portions of the complaint that are not properly pled all of which delay the process.
Of course, this all presumes that the landlord's claims of failure to pay rent or breach of lease terms are valid. If not, it may be that the tenants themselves desire a speedy resolution of the possession issues. After all, commercial tenants are businesses themselves and their bottom line is affected by prolonged litigation and the uncertainty that comes with it. Contact a business attorney to discuss your particular situation.
A cursory but informative summary of California unlawful detainer procedures may be found at the Superior Court of California Self Service Center.