Hi
 
Sometimes, out of the blue, Platinum (latest version) exibits problematic behaviour.
 
Sometimes, I insert a Synth (last time it was Roland Groove Synth) and the latency becomes huge, (about a second long)...
 
Other times, the now time vertical bar, instead of moving smoothly, jumpes by about one second at the time, along with the numbers that appear on the transport...
 
I have also experienced a delayed state where when I pressed stop or play, the music would reacte with again about one second of delay... My computer isn't a rocket, (i5 750) but it was working allright with previous versions in much larger projects..
 
When this happens, I close and re-open Sonar and things are back to normal.... Am I the only one with these problems?

You may need to check your Windows Latency with a latency checker. Try this one http://www.resplendence.com/latencymon

I did what you said and the report came out as follows:
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CONCLUSION
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Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:01:29 (h:mm:ss) on all processors.

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SYSTEM INFORMATION
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Computer name: LUC-PC
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
Hardware: ASUSTeK Computer INC., P7P55D PRO
CPU: GenuineIntel Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
Logical processors: 4
Processor groups: 1
RAM: 8190 MB total

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CPU SPEED
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Reported CPU speed: 2675 MHz
Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.

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MEASURED INTERRUPT TO USER PROCESS LATENCIES
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The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.
Highest measured interrupt to process latency (µs): 647,699137
Average measured interrupt to process latency (µs): 7,565323
Highest measured interrupt to DPC latency (µs): 125,558698
Average measured interrupt to DPC latency (µs): 3,159177

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REPORTED ISRs
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Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.
Highest ISR routine execution time (µs): 142,881495
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation
Highest reported total ISR routine time (%): 0,122623
Driver with highest ISR total time: USBPORT.SYS - Pilote de port USB 1.1 & 2.0, Microsoft Corporation
Total time spent in ISRs (%) 0,182078
ISR count (execution time <250 µs): 185509
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 0
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0

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REPORTED DPCs
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DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.
Highest DPC routine execution time (µs): 1594,933832
Driver with highest DPC routine execution time: ACPI.sys - Pilote ACPI pour NT, Microsoft Corporation
Highest reported total DPC routine time (%): 2,042724
Driver with highest DPC total execution time: USBPORT.SYS - Pilote de port USB 1.1 & 2.0, Microsoft Corporation
Total time spent in DPCs (%) 2,374610
DPC count (execution time <250 µs): 952290
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 75
DPC count (execution time 1000-1999 µs): 18
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0

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REPORTED HARD PAGEFAULTS
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Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.
NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.
Process with highest pagefault count: svchost.exe
Total number of hard pagefaults 194
Hard pagefault count of hardest hit process: 169
Highest hard pagefault resolution time (µs): 99762,081495
Total time spent in hard pagefaults (%): 0,357542
Number of processes hit: 7

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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 12,498324
CPU 0 ISR highest execution time (µs): 122,443364
CPU 0 ISR total execution time (s): 0,536077
CPU 0 ISR count: 178367
CPU 0 DPC highest execution time (µs): 201,268037
CPU 0 DPC total execution time (s): 8,265704
CPU 0 DPC count: 943340
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CPU 1 Interrupt cycle time (s): 0,768839
CPU 1 ISR highest execution time (µs): 118,869533
CPU 1 ISR total execution time (s): 0,040864
CPU 1 ISR count: 2784
CPU 1 DPC highest execution time (µs): 130,891963
CPU 1 DPC total execution time (s): 0,040276
CPU 1 DPC count: 2850
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CPU 2 Interrupt cycle time (s): 5,040655
CPU 2 ISR highest execution time (µs): 142,881495
CPU 2 ISR total execution time (s): 0,068268
CPU 2 ISR count: 3955
CPU 2 DPC highest execution time (µs): 204,566729
CPU 2 DPC total execution time (s): 0,082521
CPU 2 DPC count: 5495
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CPU 3 Interrupt cycle time (s): 1,231738
CPU 3 ISR highest execution time (µs): 60,871776
CPU 3 ISR total execution time (s): 0,005138
CPU 3 ISR count: 403
CPU 3 DPC highest execution time (µs): 1594,933832
CPU 3 DPC total execution time (s): 0,093131
CPU 3 DPC count: 698
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Try to find the driver that has the highest DPC and see if an update is available. Also stop any WIFI that is on, disable it.  If you have a network running disable it.  Look to your graphic card and disable any audio driver it is loading.  

John
Try to find the driver that has the highest DPC and see if an update is available. Also stop any WIFI that is on, disable it.  If you have a network running disable it.  Look to your graphic card and disable any audio driver it is loading.  

Thanks, but man, I do not know how to do this,... I will bring my computer to a pro..

To disable wifi go into control panel/device manager. It will be shine as a network connector. Right-click on it and select "disable" (not "uninstall").

The open and use Sonar. When finished with Sonar go back to device manager, right click on the wifi adaptor and pick "enable".

Wireless networking is a big cause of latency in Sonar and other Windows DAWs because the wifi driver keeps distracting Windows then the audio buffer fills up and you get audio dropouts. Disabling wifi might solve your problem and will almost certainly mean you can get lower latency once your problem has been solved if wifi isn't causing it.

Roland Groove Synth has always caused me problems

I have noticed intermittent sluggishness on the new version (K).   Don't have any wifi, no enabled audio drivers outside my sound card, no internet.   No idea what causes it, either.   Reloading works, but of course that's a many-minute process for a full project.