Dell may not have fully fixed the DPC latency issues that have been affecting the XPS 15 9570, but it has promised to have eliminated them from its successor, the XPS 15 7590. Deferred Procedure Call (DPC), for those who have not read our previous articles, allows drivers to execute tasks and helps a system process these requests based on their importance. Buggy, or poorly written, buggy drivers can make numerous DPC instructions, which eats up resources and makes it difficult for a system to prioritise important tasks. One of the main culprits for the XPS 15 9570 has been ACPI.sys, which has caused audio stutters and glitches when playing or mixing music.